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146-474: Two schools of thought concerning nuclear weapons emerged in the United States immediately after the end of World War II . One school, which had Secretary of War Henry Stimson as its chief proponent, believed that the apparent secrets of the atomic bomb were scientific in nature, and could not be monopolised forever. They further felt that to hold the bomb ostentatiously in reserve but to negotiate with

292-596: A Neutrality Pact in April 1941, and Japan adopted the doctrine of Nanshin-ron , promoted by the Navy, which took its focus southward and eventually led to war with the United States and the Western Allies. In Europe, Germany and Italy were becoming more aggressive. In March 1938, Germany annexed Austria , again provoking little response from other European powers. Encouraged, Hitler began pressing German claims on

438-578: A cautious French probe into the Saarland . The Western Allies also began a naval blockade of Germany , which aimed to damage the country's economy and war effort. Germany responded by ordering U-boat warfare against Allied merchant and warships, which would later escalate into the Battle of the Atlantic . On 8 September, German troops reached the suburbs of Warsaw . The Polish counter-offensive to

584-674: A "systemic failure". In 2010, the organization suffered the worst loss of life in its history, when 101 personnel died in the Haiti earthquake . Acting under the United Nations Security Council Resolution 1973 in 2011, NATO countries intervened in the First Libyan Civil War . The Millennium Summit was held in 2000 to discuss the UN's role in the 21st century. The three-day meeting was

730-621: A UN official, negotiated an armistice to the resulting conflict , with the Security Council deciding that “an armistice shall be established in all sectors of Palestine”. On 7 November 1956, the first UN peacekeeping force was established to end the Suez Crisis ; however, the UN was unable to intervene against the Soviet Union's simultaneous invasion of Hungary , following the country's revolution . On 14 July 1960,

876-1013: A myriad of autonomous, separately administered funds, programmes, research and training institutes, and other subsidiary bodies . Each of these entities have their own area of work, governance structure, and budgets such as the World Trade Organization (or the WTO) and the International Atomic Energy Agency (or the IAEA), operate independently of the UN but maintain formal partnership agreements. The UN performs much of its humanitarian work through these institutions, such as preventing famine and malnutrition (the World Food Programme ), protecting vulnerable and displaced people (the UNHCR ), and combating

1022-547: A permanent member to block adoption of a resolution, though not debate. The ten temporary seats are held for two-year terms, with five members elected each year by the General Assembly on a regional basis . The presidency of the Security Council rotates alphabetically each month. The UN Secretariat carries out the day-to-day duties required to operate and maintain the UN system. It is composed of tens of thousands of international civil servants worldwide and headed by

1168-606: A plane crash . Months later he was posthumously awarded the Nobel Peace Prize . In 1964, Hammarskjöld's successor, U Thant , deployed the UN Peacekeeping Force in Cyprus , which would become one of the UN's longest-running peacekeeping missions. With the spread of decolonization in the 1960s, the UN's membership shot up due to an influx of newly independent nations. In 1960 alone, 17 new states joined

1314-524: A pretext to initiate the invasion. The first German attack of the war came against the Polish defences at Westerplatte . The United Kingdom responded with an ultimatum for Germany to cease military operations, and on 3 September, after the ultimatum was ignored, Britain and France declared war on Germany. During the Phoney War period, the alliance provided no direct military support to Poland, outside of

1460-781: A pretext to worsen relations. On 29 August, Hitler demanded that a Polish plenipotentiary immediately travel to Berlin to negotiate the handover of Danzig , and to allow a plebiscite in the Polish Corridor in which the German minority would vote on secession. The Poles refused to comply with the German demands, and on the night of 30–31 August in a confrontational meeting with the British ambassador Nevile Henderson , Ribbentrop declared that Germany considered its claims rejected. On 1 September 1939, Germany invaded Poland after having staged several false flag border incidents as

1606-475: A secret protocol that defined German and Soviet "spheres of influence" (western Poland and Lithuania for Germany; eastern Poland , Finland, Estonia , Latvia and Bessarabia for the Soviet Union), and raised the question of continuing Polish independence. The pact neutralised the possibility of Soviet opposition to a campaign against Poland and assured that Germany would not have to face the prospect of

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1752-713: A similar pact and rejected ceding part of its territory to the Soviet Union. The Soviet Union invaded Finland in November 1939, and was subsequently expelled from the League of Nations for this crime of aggression. Despite overwhelming numerical superiority, Soviet military success during the Winter War was modest, and the Finno-Soviet war ended in March 1940 with some Finnish concessions of territory . In June 1940,

1898-531: A two-front war, as it had in World War   I. Immediately afterwards, Hitler ordered the attack to proceed on 26 August, but upon hearing that the United Kingdom had concluded a formal mutual assistance pact with Poland and that Italy would maintain neutrality, he decided to delay it. In response to British requests for direct negotiations to avoid war, Germany made demands on Poland, which served as

2044-445: A two-thirds majority of those present and voting is required. All other questions are decided by a majority vote. Each member has one vote. Apart from the approval of budgetary matters, resolutions are not binding on the members. The Assembly may make recommendations on any matters within the scope of the UN, except matters of peace and security that are under consideration by the Security Council. Draft resolutions can be forwarded to

2190-889: A wide variety of complex tasks. The UN comprises six principal operational organizations: the General Assembly , the Security Council , the Economic and Social Council , the International Court of Justice , the UN Secretariat , and the Trusteeship Council , although the Trusteeship Council has been suspended since 1994. The UN System includes a multitude of specialized agencies , funds, and programmes, including

2336-1033: A wide variety of topics. These include the United Nations Permanent Forum on Indigenous Issues , which advises UN agencies on issues relating to indigenous peoples , the United Nations Forum on Forests , which coordinates and promotes sustainable forest management, the United Nations Statistical Commission , which co-ordinates information-gathering efforts between agencies, and the Commission on Sustainable Development , which co-ordinates efforts between UN agencies and NGOs working towards sustainable development . ECOSOC may also grant consultative status to non-governmental organizations. as of April 2021 almost 5,600 organizations have this status. The UN Charter stipulates that each primary organ of

2482-467: Is defined in the UN Charter as the organization's chief administrative officer. Article 99 of the charter states that the secretary-general can bring to the Security Council's attention "any matter which in their opinion may threaten the maintenance of international peace and security", a phrase that secretaries-general since Trygve Lie have interpreted as giving the position broad scope for action on

2628-597: Is widely recognised as the world's largest international organization. The UN is headquartered in New York City , in international territory with certain privileges extraterritorial to the United States, and the UN has other offices in Geneva , Nairobi , Vienna , and The Hague , where the International Court of Justice is headquartered at the Peace Palace . The UN was established after World War II with

2774-604: The Anglo-German Naval Agreement and the German–Polish declaration of non-aggression . The situation became a crisis in late August as German troops continued to mobilise against the Polish border. On 23 August the Soviet Union signed a non-aggression pact with Germany, after tripartite negotiations for a military alliance between France, the United Kingdom, and Soviet Union had stalled. This pact had

2920-603: The Battle of Mogadishu . The UN mission to Bosnia faced worldwide ridicule for its indecisive and confused mission in the face of ethnic cleansing. In 1994, the UN Assistance Mission for Rwanda failed to intervene in the Rwandan genocide amidst indecision in the Security Council. From the late 1990s to the early 2000s, international interventions authorized by the UN took a wider variety of forms. The United Nations Security Council Resolution 1244 authorised

3066-528: The Four Power Declaration on General Security which aimed for the creation "at the earliest possible date of a general international organization". This was the first public announcement that a new international organization was being contemplated to replace the League of Nations. The Tehran Conference followed shortly afterwards at which Roosevelt, Churchill and Joseph Stalin , the leader of

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3212-581: The German Revolution of 1918–1919 , and a democratic government, later known as the Weimar Republic , was created. The interwar period saw strife between supporters of the new republic and hardline opponents on both the political right and left. Italy, as an Entente ally, had made some post-war territorial gains; however, Italian nationalists were angered that the promises made by the United Kingdom and France to secure Italian entrance into

3358-540: The Group of 77 under the leadership of Algeria, which briefly became a dominant power at the UN. On 10 November 1975, a bloc comprising the Soviet Union and Third World nations passed a resolution , over strenuous American and Israeli opposition, declaring Zionism to be a form of racism . The resolution was repealed on 16 December 1991, shortly after the end of the Cold War. With an increasing Third World presence and

3504-472: The ICJ Statute , which forms an integral part of the UN Charter, and non-members may also become parties. The ICJ's rulings are binding upon parties and, along with its advisory opinions, serve as sources of international law . The court is composed of 15 judges appointed to nine-year terms by the General Assembly. Every sitting judge must be from a different nation. The Economic and Social Council (or

3650-710: The Italian invasion of Abyssinia on 3 October 1935. The British historian Antony Beevor views the beginning of World War   II as the Battles of Khalkhin Gol fought between Japan and the forces of Mongolia and the Soviet Union from May to September 1939. Others view the Spanish Civil War as the start or prelude to World War II. The exact date of the war's end also is not universally agreed upon. It

3796-642: The League of Nations as a force to preserve peace. Both Italy and Ethiopia were member nations, but the League did little when the former clearly violated Article X of the League's Covenant . The United Kingdom and France supported imposing sanctions on Italy for the invasion, but the sanctions were not fully enforced and failed to end the Italian invasion. Italy subsequently dropped its objections to Germany's goal of absorbing Austria . When civil war broke out in Spain, Hitler and Mussolini lent military support to

3942-528: The NATO -led Kosovo Force beginning in 1999. The UN mission in the Sierra Leone Civil War was supplemented by a British military intervention . The invasion of Afghanistan in 2001 was overseen by NATO. In 2003, the United States invaded Iraq despite failing to pass a UN Security Council resolution for authorization, prompting a new round of questioning of the UN's effectiveness. Under

4088-731: The Nationalist rebels , led by General Francisco Franco . Italy supported the Nationalists to a greater extent than the Nazis: Mussolini sent more than 70,000 ground troops, 6,000 aviation personnel, and 720 aircraft to Spain. The Soviet Union supported the existing government of the Spanish Republic . More than 30,000 foreign volunteers, known as the International Brigades , also fought against

4234-820: The Paris Peace Conference . The League of Nations was approved and started operations, but the United States never joined. On 10 January 1920, the League of Nations formally came into being when the Covenant of the League of Nations , ratified by 42 nations in 1919, took effect. The League Council acted as an executive body directing the Assembly's business. It began with four permanent members—the United Kingdom , France , Italy , and Japan . After some limited successes and failures during

4380-515: The Paris Peace Conference . The organisation's primary goals were to prevent armed conflict through collective security, military, and naval disarmament , as well as settling international disputes through peaceful negotiations and arbitration. Despite strong pacifist sentiment after World War   I , irredentist and revanchist nationalism had emerged in several European states. These sentiments were especially marked in Germany because of

4526-690: The Rome–Berlin Axis . A month later, Germany and Japan signed the Anti-Comintern Pact , which Italy joined the following year. The Kuomintang (KMT) party in China launched a unification campaign against regional warlords and nominally unified China in the mid-1920s, but was soon embroiled in a civil war against its former Chinese Communist Party (CCP) allies and new regional warlords . In 1931, an increasingly militaristic Empire of Japan , which had long sought influence in China as

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4672-545: The Soviet Union not to develop one would simply drive the Soviets into developing their own weapon to restore the balance of power. The other school included men like Secretary of State James F. Byrnes , who felt that the US monopoly on atomic weapons had been honestly earned and should not be surrendered. In their view, the Soviets understood only power, which could be met only with nuclear weapons. President Harry S. Truman

4818-590: The Soviet–Japanese Neutrality Pact in April 1941. By contrast, the Germans were steadily making preparations for an attack on the Soviet Union, massing forces on the Soviet border. Hitler believed that the United Kingdom's refusal to end the war was based on the hope that the United States and the Soviet Union would enter the war against Germany sooner or later. On 31 July 1940, Hitler decided that

4964-543: The Stresa Front in April 1935 in order to contain Germany, a key step towards military globalisation ; however, that June, the United Kingdom made an independent naval agreement with Germany, easing prior restrictions. The Soviet Union, concerned by Germany's goals of capturing vast areas of Eastern Europe , drafted a treaty of mutual assistance with France. Before taking effect, though, the Franco-Soviet pact

5110-709: The Sudetenland , an area of Czechoslovakia with a predominantly ethnic German population. Soon the United Kingdom and France followed the appeasement policy of British Prime Minister Neville Chamberlain and conceded this territory to Germany in the Munich Agreement , which was made against the wishes of the Czechoslovak government, in exchange for a promise of no further territorial demands. Soon afterwards, Germany and Italy forced Czechoslovakia to cede additional territory to Hungary, and Poland annexed

5256-707: The Tanggu Truce was signed in 1933. Thereafter, Chinese volunteer forces continued the resistance to Japanese aggression in Manchuria , and Chahar and Suiyuan . After the 1936 Xi'an Incident , the Kuomintang and CCP forces agreed on a ceasefire to present a united front to oppose Japan. The Second Italo-Ethiopian War was a brief colonial war that began in October 1935 and ended in May 1936. The war began with

5402-466: The Trans-Olza region of Czechoslovakia. Although all of Germany's stated demands had been satisfied by the agreement, privately Hitler was furious that British interference had prevented him from seizing all of Czechoslovakia in one operation. In subsequent speeches Hitler attacked British and Jewish "war-mongers" and in January 1939 secretly ordered a major build-up of the German navy to challenge British naval supremacy. In March 1939, Germany invaded

5548-506: The Treaty of Craiova . The loss of one-third of Romania's 1939 territory caused a coup against King Carol II, turning Romania into a fascist dictatorship under Marshal Ion Antonescu , with a course set towards the Axis in the hopes of a German guarantee. Meanwhile, German-Soviet political relations and economic co-operation gradually stalled, and both states began preparations for war. In April 1940, Germany invaded Denmark and Norway to protect shipments of iron ore from Sweden , which

5694-426: The Wehrmacht rapidly advanced to the Channel and cut off the Allied forces in Belgium, trapping the bulk of the Allied armies in a cauldron on the Franco-Belgian border near Lille. The United Kingdom was able to evacuate a significant number of Allied troops from the continent by early June, although they had to abandon almost all their equipment. On 10 June, Italy invaded France , declaring war on both France and

5840-459: The White House in December 1941 for the Arcadia Conference . Roosevelt is considered a founder of the UN, and coined the term United Nations to describe the Allied countries . Churchill accepted it, noting its use by Lord Byron . The text of the Declaration by United Nations was drafted on 29 December 1941, by Roosevelt, Churchill, and Harry Hopkins . It incorporated Soviet suggestions but included no role for France. One major change from

5986-446: The World Bank Group , the World Health Organization , the World Food Programme , UNESCO , and UNICEF . Additionally, non-governmental organizations may be granted consultative status with the Economic and Social Council and other agencies. The UN's chief administrative officer is the secretary-general , currently António Guterres , who is a Portuguese politician and diplomat. He began his first five-year term on 1 January 2017 and

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6132-628: The aim of preventing future world wars , and succeeded the League of Nations , which was characterized as being ineffective. On 25 April 1945, 50 nations assembled in San Francisco , California, for a conference and initialised the drafting of the UN Charter , which was adopted on 25 June 1945. The charter took effect on 24 October 1945, when the UN began operations. The UN's objectives, as outlined by its charter, include maintaining international peace and security, protecting human rights , delivering humanitarian aid , promoting sustainable development , and upholding international law . At its founding,

6278-406: The secretary-general , who is assisted by the deputy secretary-general . The Secretariat's duties include providing information and facilities needed by UN bodies for their meetings and carrying out tasks as directed by the Security Council, the General Assembly, the Economic and Social Council, and other UN bodies. The secretary-general acts as the spokesperson and leader of the UN. The position

6424-419: The 1917 Bolshevik seizure of power in Russia , which led to the founding of the Soviet Union. Meanwhile, the victorious Allies of World War I , such as France, Belgium, Italy, Romania, and Greece, gained territory, and new nation-states were created out of the dissolution of the Austro-Hungarian, Ottoman, and Russian Empires. To prevent a future world war, the League of Nations was established in 1920 by

6570-568: The 1920s, the League proved ineffective in the 1930s, as it failed to act against the Japanese invasion of Manchuria in 1933. Forty nations voted for Japan to withdraw from Manchuria but Japan voted against it and walked out of the League instead of withdrawing from Manchuria. It also failed to act against the Second Italo-Ethiopian War , after the appeal for international intervention by Ethiopian Emperor Haile Selassie I at Geneva in 1936 went with no avail, including when calls for economic sanctions against Italy failed. Italy and other nations left

6716-409: The Allies were attempting to cut off . Denmark capitulated after six hours , and despite Allied support , Norway was conquered within two months. British discontent over the Norwegian campaign led to the resignation of Prime Minister Neville Chamberlain , who was replaced by Winston Churchill on 10   May 1940. On the same day, Germany launched an offensive against France . To circumvent

6862-410: The Asia-Pacific , and by 1937 was at war with the Republic of China . In December 1941, Japan attacked American and British territories in Southeast Asia and the Central Pacific , including Pearl Harbor in Hawaii , which resulted in the US and the UK declaring war against Japan, and the European Axis declaring war on the US. Japan conquered much of coastal China and Southeast Asia , but its advances in

7008-445: The Atlantic Charter was the addition of a provision for religious freedom , which Stalin approved after Roosevelt insisted. Roosevelt's idea of the " Four Powers ", refers to the four major Allied countries, the United States, the United Kingdom, the Soviet Union, and China , emerged in the Declaration by the United Nations. On New Year's Day 1942, Roosevelt, Churchill, the Soviet Union's former Foreign Minister Maxim Litvinov , and

7154-400: The Axis war against the Soviet Union, in Romania's case partially to recapture territory ceded to the Soviet Union . In early June 1940, the Italian Regia Aeronautica attacked and besieged Malta , a British possession. From late summer to early autumn, Italy conquered British Somaliland and made an incursion into British-held Egypt . In October, Italy attacked Greece , but the attack

7300-421: The Blitz , but largely ended in May 1941 after failing to significantly disrupt the British war effort. Using newly captured French ports, the German Navy enjoyed success against an over-extended Royal Navy , using U-boats against British shipping in the Atlantic . The British Home Fleet scored a significant victory on 27   May 1941 by sinking the German battleship Bismarck . In November 1939,

7446-400: The Charter by the five permanent members of the Security Council : the United States, the United Kingdom, France, the Soviet Union and China — and by a majority of the other 46 nations. The first meetings of the General Assembly , with 51 nations represented, and the Security Council took place in London beginning in January 1946. Debates began at once, covering topical issues such as

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7592-428: The Chinese Premier T. V. Soong signed the " Declaration by United Nations ", and the next day the representatives of twenty-two other nations added their signatures. During the war, the United Nations became the official term for the Allies. In order to join, countries had to sign the Declaration and declare war on the Axis powers . The October 1943 Moscow Conference resulted in the Moscow Declarations , including

7738-428: The ECOSOC) assists the General Assembly in promoting international economic and social co-operation and development. It was established to serve as the UN's primary forum for global issues and is the largest and most complex UN body. The ECOSOC's functions include gathering data, conducting studies and advising and making recommendations to member states. Its work is carried out primarily by subsidiary bodies focused on

7884-410: The French possessions of Syria and Lebanon , assisted by the Free French . With the situation in Europe and Asia relatively stable, Germany, Japan, and the Soviet Union made preparations for war. With the Soviets wary of mounting tensions with Germany, and the Japanese planning to take advantage of the European War by seizing resource-rich European possessions in Southeast Asia , the two powers signed

8030-420: The General Assembly by its six main committees: As well as by the following two committees: The Security Council is charged with maintaining peace and security among nations. While other organs of the UN can only make recommendations to member states, the Security Council has the power to make binding decisions that member states have agreed to carry out, under the terms of Charter Article 25. The decisions of

8176-426: The Germans, and the last large operational unit of the Polish Army surrendered on 6   October . Despite the military defeat, Poland never surrendered; instead, it formed the Polish government-in-exile and a clandestine state apparatus remained in occupied Poland. A significant part of Polish military personnel evacuated to Romania and Latvia; many of them later fought against the Axis in other theatres of

8322-445: The Holocaust of European Jews, as well as from massacres, starvation, and disease. Following the Allied powers' victory, Germany , Austria , Japan , and Korea were occupied, and war crimes tribunals were conducted against German and Japanese leaders . The causes of World War II included unresolved tensions in the aftermath of World War I and the rise of fascism in Europe and militarism in Japan . Key events leading up to

8468-422: The League. When war broke out in 1939 , the League effectively closed down. The first step towards the establishment of the United Nations was the Inter-Allied Conference in London that led to the Declaration of St James's Palace on 12 June 1941. By August 1941, American President Franklin Roosevelt and British Prime Minister Winston Churchill had drafted the Atlantic Charter ; which defined goals for

8614-450: The Nationalists. Both Germany and the Soviet Union used this proxy war as an opportunity to test in combat their most advanced weapons and tactics. The Nationalists won the civil war in April 1939; Franco, now dictator, remained officially neutral during World War   II but generally favoured the Axis . His greatest collaboration with Germany was the sending of volunteers to fight on the Eastern Front . In July 1937, Japan captured

8760-444: The Pacific were halted in mid-1942 after its defeat in the naval Battle of Midway ; Germany and Italy were defeated in North Africa and at Stalingrad in the Soviet Union. Key setbacks in 1943—including German defeats on the Eastern Front, the Allied invasions of Sicily and the Italian mainland , and Allied offensives in the Pacific—cost the Axis powers their initiative and forced them into strategic retreat on all fronts. In 1944,

8906-452: The Royal Navy putting three Italian battleships out of commission after a carrier attack at Taranto , and neutralising several more warships at the Battle of Cape Matapan . Italian defeats prompted Germany to deploy an expeditionary force to North Africa; at the end of March 1941, Rommel 's Afrika Korps launched an offensive which drove back Commonwealth forces. In less than a month, Axis forces advanced to western Egypt and besieged

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9052-423: The Soviet Union occupied the entire territories of Estonia, Latvia and Lithuania, as well as the Romanian regions of Bessarabia, Northern Bukovina, and the Hertsa region . In August 1940, Hitler imposed the Second Vienna Award on Romania which led to the transfer of Northern Transylvania to Hungary. In September 1940, Bulgaria demanded Southern Dobruja from Romania with German and Italian support, leading to

9198-418: The Soviet Union and Mongolia . The Japanese doctrine of Hokushin-ron , which emphasised Japan's expansion northward, was favoured by the Imperial Army during this time. This policy would prove difficult to maintain in light of the Japanese defeat at Khalkin Gol in 1939, the ongoing Second Sino-Japanese War and ally Nazi Germany pursuing neutrality with the Soviets. Japan and the Soviet Union eventually signed

9344-407: The Soviet Union but still insisting that the Soviets should agree not to develop the bomb. Those were modifications that neither Acheson nor Lilienthal accepted. That, combined with US continued insistence on retaining the bomb until it was satisfied with the effectiveness of international control, ultimately led to the plan's rejection by the Soviets to the surprise of no one. The consultants heading

9490-575: The Soviet Union should be eliminated and aimed for the conquest of Ukraine , the Baltic states and Byelorussia . However, other senior German officials like Ribbentrop saw an opportunity to create a Euro-Asian bloc against the British Empire by inviting the Soviet Union into the Tripartite Pact. In November 1940, negotiations took place to determine if the Soviet Union would join the pact. The Soviets showed some interest but asked for concessions from Finland, Bulgaria, Turkey, and Japan that Germany considered unacceptable. On 18 December 1940, Hitler issued

9636-400: The Soviet Union was ever signed, although the state of war between the two countries was terminated by the Soviet–Japanese Joint Declaration of 1956 , which also restored full diplomatic relations between them. World War I had radically altered the political European map with the defeat of the Central Powers —including Austria-Hungary , Germany , Bulgaria , and the Ottoman Empire —and

9782-427: The Soviet Union, and the signing of the Korean Armistice Agreement on 27 July 1953. On 29 November 1947, the General Assembly approved resolution 181 , a proposal to partition Palestine into two state, with Jerusalem placed under a special international regime. The plan failed and a civil war broke out in Palestine, that led to the creation of the state of Israel afterward. Two years later, Ralph Bunche ,

9928-400: The Soviet Union, before all the issues were resolved. By 1 March 1945, 21 additional states had signed the Declaration by the United Nations. After months of planning, the UN Conference on International Organization opened in San Francisco on 25 April 1945. It was attended by 50 nations' governments and a number of non-governmental organizations. The delegations of the Big Four chaired

10074-451: The Soviet Union, met and discussed the idea of a post-war international organization. The new international organisation was formulated and negotiated amongst the delegations from the Allied Big Four at the Dumbarton Oaks Conference from 21 September to 7 October 1944. They agreed on proposals for the aims, structure and functioning of the new organization. It took the conference at Yalta in February 1945, and further negotiations with

10220-499: The UN authorized a US-led coalition that repulsed Iraq's invasion of Kuwait . Brian Urquhart , the under-secretary-general of the UN from 1971 to 1985, later described the hopes raised by these successes as a "false renaissance" for the organization, given the more troubled missions that followed. Beginning in the last decades of the Cold War , critics of the UN condemned the organization for perceived mismanagement and corruption. In 1984, American President Ronald Reagan withdrew

10366-412: The UN established the United Nations Operation in the Congo (or UNOC), the largest military force of its early decades, to bring order to Katanga , restoring it to the control of the Democratic Republic of the Congo by 11 May 1964. While travelling to meet rebel leader Moise Tshombe during the conflict, Dag Hammarskjöld , often named as one of the UN's most effective secretaries-general, died in

10512-562: The UN had 51 member states ; as of 2024 , it has 193 sovereign states , nearly all of the world's recognized sovereign states. The UN's mission to preserve world peace was complicated in its initial decades due in part to Cold War tensions that existed between the United States and Soviet Union and their respective allies. Its mission has included the provision of primarily unarmed military observers and lightly armed troops charged with primarily monitoring, reporting and confidence-building roles. UN membership grew significantly following

10658-488: The UN itself and operate with almost complete independence from it". These include specialized agencies, research and training institutions, programmes and funds and other UN entities. All organizations in the UN system obey the Noblemaire principle , which calls for salaries that will attract and retain citizens of countries where compensation is highest, and which ensures equal pay for work of equal value regardless of

10804-529: The UN's focus on promoting development, peacekeeping, human rights and global security. The Sustainable Development Goals (or SDGs) were launched in 2015 to succeed the Millennium Development Goals. In addition to addressing global challenges, the UN has sought to improve its accountability and democratic legitimacy by engaging more with civil society and fostering a global constituency. In an effort to enhance transparency, in 2016

10950-520: The UN's primary mandate was peacekeeping , the division between the United States and the Soviet Union often paralysed the organization; generally allowing it to intervene only in conflicts distant from the Cold War . Two notable exceptions were a Security Council resolution on 7 July 1950 authorizing a US-led coalition to repel the North Korean invasion of South Korea , passed in the absence of

11096-582: The UN, 16 of them from Africa. On 25 October 1971, with opposition from the United States, but with the support of many Third World nations, the People's Republic of China was given the Chinese seat on the Security Council in place of the Republic of China (also known as Taiwan). The vote was widely seen as a sign of waning American influence in the organization. Third World nations organized themselves into

11242-581: The United Kingdom and France guaranteed their support for Polish independence ; when Italy conquered Albania in April 1939, the same guarantee was extended to the Kingdoms of Romania and Greece . Shortly after the Franco - British pledge to Poland, Germany and Italy formalised their own alliance with the Pact of Steel . Hitler accused the United Kingdom and Poland of trying to "encircle" Germany and renounced

11388-542: The United Kingdom attacked on 3   July in an attempt to prevent its seizure by Germany. The air Battle of Britain began in early July with Luftwaffe attacks on shipping and harbours . The German campaign for air superiority started in August but its failure to defeat RAF Fighter Command forced the indefinite postponement of the proposed German invasion of Britain . The German strategic bombing offensive intensified with night attacks on London and other cities in

11534-461: The United Kingdom. The Germans turned south against the weakened French army, and Paris fell to them on 14   June. Eight days later France signed an armistice with Germany ; it was divided into German and Italian occupation zones , and an unoccupied rump state under the Vichy Regime , which, though officially neutral, was generally aligned with Germany. France kept its fleet, which

11680-700: The United Nations can establish various specialized agencies to fulfill its duties. Specialized agencies are autonomous organizations working with the United Nations and each other through the coordinating machinery of the Economic and Social Council. Each was integrated into the UN system through an agreement with the UN under UN Charter article 57. There are fifteen specialized agencies, which perform functions as diverse as facilitating international travel, preventing and addressing pandemics, and promoting economic development. The United Nations system includes

11826-713: The United States was assisting China and the Western Allies, and had amended the Neutrality Act to allow "cash and carry" purchases by the Allies. In 1940, following the German capture of Paris, the size of the United States Navy was significantly increased . In September the United States further agreed to a trade of American destroyers for British bases . Still, a large majority of the American public continued to oppose any direct military intervention in

11972-560: The United States' funding from the United Nations Educational, Scientific and Cultural Organisation (or UNESCO) over allegations of mismanagement, followed by the United Kingdom and Singapore. Boutros Boutros-Ghali , the secretary-general from 1992 to 1996, initiated a reform of the Secretariat, somewhat reducing the size of the organisation. His successor, Kofi Annan , initiated further management reforms in

12118-590: The Western Allies and the Soviet Union, culminating in the fall of Berlin to Soviet troops; Hitler's suicide ; and the German unconditional surrender on 8 May 1945 . Following the refusal of Japan to surrender on the terms of the Potsdam Declaration , the US dropped the first atomic bombs on Hiroshima and Nagasaki on 6 and 9 August. Faced with an imminent invasion of the Japanese archipelago ,

12264-528: The Western Allies invaded German-occupied France at Normandy , while the Soviet Union regained its territorial losses and pushed Germany and its allies westward. At the same time, Japan suffered reversals in mainland Asia, while the Allies crippled the Japanese Navy and captured key islands . The war in Europe concluded with the liberation of German-occupied territories ; the invasion of Germany by

12410-551: The Yellow River ; this manoeuvre bought time for the Chinese to prepare their defences at Wuhan , but the city was taken by October. Japanese military victories did not bring about the collapse of Chinese resistance that Japan had hoped to achieve; instead, the Chinese government relocated inland to Chongqing and continued the war. In the mid-to-late 1930s, Japanese forces in Manchukuo had sporadic border clashes with

12556-680: The aerial Battle of Britain and the Blitz , and naval Battle of the Atlantic . Through a series of campaigns and treaties, Germany took control of much of continental Europe and formed the Axis alliance with Italy , Japan , and other countries. In June 1941, Germany led the European Axis in an invasion of the Soviet Union , opening the Eastern Front and initially making large territorial gains. Japan aimed to dominate East Asia and

12702-709: The assembly gathers at annual sessions at the General Assembly Hall , but emergency sessions can be summoned. The assembly is led by a president , elected by the member states on a rotating regional basis, and 21 vice-presidents. The first session convened on 10 January 1946 in the Methodist Central Hall in London and comprised representatives of 51 nations. When the General Assembly decides on seminal questions such as those on peace and security, admission of new members and budgetary matters,

12848-529: The basis of the Convention on the Privileges and Immunities of the United Nations , the UN and its agencies are immune from the laws of the countries where they operate, safeguarding the UN's impartiality with regard to host and member countries. Below the six organs are, in the words of the author Linda Fasulo, "an amazing collection of entities and organizations, some of which are actually older than

12994-640: The beginning of the Pacific War include the start of the Second Sino-Japanese War on 7 July 1937, or the earlier Japanese invasion of Manchuria , on 19 September 1931. Others follow the British historian A. J. P. Taylor , who stated that the Sino-Japanese War and war in Europe and its colonies occurred simultaneously, and the two wars became World War II in 1941. Other proposed starting dates for World War II include

13140-643: The beginning of the Report embodies the comments that Acheson's Committee made on the unanimous findings and recommendations of the Board of Consultants. The other members of the committee were scientists James Conant and Vannevar Bush , the director of the Office of Scientific Research and Development , which controlled the Manhattan Project , and John McCloy , and General Leslie R. Groves , who had been

13286-589: The body's former headquarters in the Peace Palace in The Hague, Netherlands , making it the only principal organ not based in New York City. The ICJ's main function is adjudicating disputes among nations. Examples of issues they have heard include war crimes, violations of state sovereignty and ethnic cleansing. The court can also be called upon by other UN organs to provide advisory opinions on matters of international law. All UN member states are parties to

13432-461: The capital Nanking in December 1937. After the fall of Nanking, tens or hundreds of thousands of Chinese civilians and disarmed combatants were murdered by the Japanese . In March 1938, Nationalist Chinese forces won their first major victory at Taierzhuang , but then the city of Xuzhou was taken by the Japanese in May. In June 1938, Chinese forces stalled the Japanese advance by flooding

13578-622: The century prior to the UN's creation, several international organizations such as the International Committee of the Red Cross were formed to ensure protection and assistance for victims of armed conflict and strife. During World War I , several major leaders, especially U.S. President Woodrow Wilson , advocated for a world body to guarantee peace. The winners of the war, the Allies , met to decide on formal peace terms at

13724-403: The conflict well into 1941. In December 1940, Roosevelt accused Hitler of planning world conquest and ruled out any negotiations as useless, calling for the United States to become an " arsenal of democracy " and promoting Lend-Lease programmes of military and humanitarian aid to support the British war effort; Lend-Lease was later extended to the other Allies, including the Soviet Union after it

13870-561: The control of atomic energy to a United Nations Atomic Energy Commission was endorsed by both the Americans and the Soviets in 1945. They had the forum, but the United States had not yet articulated a policy that it wished the new commission to adopt. To resolve the problem, Acheson was appointed to head a committee to determine US policy on atomic energy, the Committee on Atomic Energy, set up on January 7, 1946. A letter of transmittal at

14016-537: The council are known as United Nations Security Council resolutions . The Security Council is made up of fifteen member states: five permanent members (China, France, Russia, the United Kingdom and the United States) and ten non-permanent members (currently Algeria , Ecuador , Guyana , Japan , Malta , Mozambique , the Republic of Korea , Sierra Leone , Slovenia and Switzerland ). The five permanent members hold veto power over UN resolutions, allowing

14162-526: The creation of a " New Roman Empire ". Adolf Hitler , after an unsuccessful attempt to overthrow the German government in 1923, eventually became the Chancellor of Germany in 1933 when Paul von Hindenburg and the Reichstag appointed him. Following Hindenburg's death in 1934, Hitler proclaimed himself Führer of Germany and abolished democracy, espousing a radical, racially motivated revision of

14308-552: The development of additional atomic bombs. This was to prove too controversial. Although Truman accepted the report in general, his appointment of financier Bernard Baruch to carry the proposal forward in the United Nations led to demands for punishment for violations and that those penalties could not be vetoed by the United Nations Security Council , as well as unrestricted inspections within

14454-416: The directive to prepare for an invasion of the Soviet Union. United Nations The United Nations ( UN ) is a diplomatic and political international organization with the intended purpose of maintaining international peace and security , developing friendly relations among nations, achieving international cooperation, and serving as a center for coordinating the actions of member nations. It

14600-402: The distinction between military and civilian resources. Tanks and aircraft played major roles , with the latter enabling the strategic bombing of population centres and delivery of the only two nuclear weapons ever used in war. World War II was the deadliest conflict in history, resulting in 70 to 85 million deaths , more than half being civilians. Millions died in genocides , including

14746-883: The eighth secretary-general, Ban Ki-moon , the UN intervened with peacekeepers in crises such as the War in Darfur in Sudan and the Kivu conflict in the Democratic Republic of the Congo and sent observers and chemical weapons inspectors to the Syrian Civil War . In 2013, an internal review of UN actions in the final battles of the Sri Lankan Civil War in 2009 concluded that the organization had suffered

14892-500: The employee's nationality. In practice, the International Civil Service Commission , which governs the conditions of UN personnel, takes reference to the highest-paying national civil service. Staff salaries are subject to an internal tax that is administered by the UN organizations. The General Assembly is the primary deliberative assembly of the UN. Composed of all UN member states ,

15038-712: The end of May completed the German conquest of the Balkans. Partisan warfare subsequently broke out against the Axis occupation of Yugoslavia , which continued until the end of the war. In the Middle East in May, Commonwealth forces quashed an uprising in Iraq which had been supported by German aircraft from bases within Vichy-controlled Syria . Between June and July, British-led forces invaded and occupied

15184-492: The face of threats from the US to withhold its UN dues. Though the UN Charter had been written primarily to prevent aggression by one nation against another, in the early 1990s the UN faced several simultaneous, serious crises within Somalia, Haiti, Mozambique, and the nations that previously made up Yugoslavia. The UN mission in Somalia was widely viewed as a failure after the United States' withdrawal following casualties in

15330-504: The failure of UN mediation in conflicts in the Middle East , Vietnam , and Kashmir , the UN increasingly shifted its attention to its secondary goals of economic development and cultural exchange. By the 1970s, the UN budget for social and economic development was far greater than its peacekeeping budget. After the Cold War, the UN saw a radical expansion in its peacekeeping duties, taking on more missions in five years than it had in

15476-575: The first step of what its government saw as the country's right to rule Asia , staged the Mukden incident as a pretext to invade Manchuria and establish the puppet state of Manchukuo . China appealed to the League of Nations to stop the Japanese invasion of Manchuria. Japan withdrew from the League of Nations after being condemned for its incursion into Manchuria. The two nations then fought several battles, in Shanghai , Rehe and Hebei , until

15622-659: The five principal organs are located at the main UN Headquarters in New York City, while the International Court of Justice is seated in The Hague . Most other major agencies are based in the UN offices at Geneva , Vienna , and Nairobi , and additional UN institutions are located throughout the world. The six official languages of the UN, used in intergovernmental meetings and documents, are Arabic , Chinese , English , French , Russian and Spanish . On

15768-864: The former Chinese imperial capital of Peking after instigating the Marco Polo Bridge incident , which culminated in the Japanese campaign to invade all of China. The Soviets quickly signed a non-aggression pact with China to lend materiel support, effectively ending China's prior cooperation with Germany . From September to November, the Japanese attacked Taiyuan , engaged the Kuomintang Army around Xinkou , and fought Communist forces in Pingxingguan . Generalissimo Chiang Kai-shek deployed his best army to defend Shanghai , but after three months of fighting, Shanghai fell. The Japanese continued to push Chinese forces back, capturing

15914-525: The invasion of the Ethiopian Empire (also known as Abyssinia ) by the armed forces of the Kingdom of Italy ( Regno d'Italia ), which was launched from Italian Somaliland and Eritrea . The war resulted in the military occupation of Ethiopia and its annexation into the newly created colony of Italian East Africa ( Africa Orientale Italiana , or AOI); in addition it exposed the weakness of

16060-481: The largest gathering of world leaders in history, and it culminated in the adoption by all member states of the Millennium Development Goals (or MDGs), a commitment to achieve international development in areas such as poverty reduction , gender equality and public health . Progress towards these goals, which were to be met by 2015, was ultimately uneven. The 2005 World Summit reaffirmed

16206-579: The military officer in charge of the Manhattan Project. Acheson decided that the committee needed technical advice and so he appointed a board of consultants with David Lilienthal , the well-regarded chairman of the Tennessee Valley Authority , as chairman. He also appointed J. Robert Oppenheimer , scientific leader of the Manhattan Project, who provided influential advice. Oppenheimer's contribution lay in an idea to police

16352-461: The organization are five principal organs established by the UN Charter: the General Assembly , the Security Council , the Economic and Social Council , the International Court of Justice and the UN Secretariat . A sixth principal organ, the Trusteeship Council , suspended its operations on 1 November 1994 upon the independence of Palau ; the last remaining UN trustee territory. Four of

16498-506: The organization held its first public debate between candidates for secretary-general. On 1 January 2017, Portuguese diplomat António Guterres , who had previously served as the UN High Commissioner for Refugees , became the ninth secretary-general. Guterres has highlighted several key goals for his administration, including an emphasis on diplomacy for preventing conflicts, more effective peacekeeping efforts, and streamlining

16644-482: The organization to be more responsive and versatile to international needs. On 13 June 2019, the UN signed a Strategic Partnership Framework with the World Economic Forum in order to "jointly accelerate" the implementation of the 2030 Agenda for Sustainable Development . The United Nations is part of the broader UN System, which includes an extensive network of institutions and entities. Central to

16790-471: The plenary meetings. Previously, Churchill had urged Roosevelt to restore France to its status of a major power after the liberation of Paris in August 1944. The drafting of the Charter of the United Nations was completed over the following two months, and it was signed on 26 June 1945 by the representatives of the 50 countries. The UN officially came into existence on 24 October 1945, upon ratification of

16936-599: The port of Tobruk . By late March 1941, Bulgaria and Yugoslavia signed the Tripartite Pact ; however, the Yugoslav government was overthrown two days later by pro-British nationalists. Germany and Italy responded with simultaneous invasions of both Yugoslavia and Greece , commencing on 6 April 1941; both nations were forced to surrender within the month. The airborne invasion of the Greek island of Crete at

17082-414: The possibility of further atomic bombings, and the Soviet declaration of war against Japan and its invasion of Manchuria , Japan announced its unconditional surrender on 15 August and signed a surrender document on 2 September 1945 , marking the end of the war. World War II changed the political alignment and social structure of the world, and it set the foundation of international relations for

17228-553: The post, but over the years it has become accepted that the position shall be held for one or two terms of five years. The current secretary-general is António Guterres of Portugal, who replaced Ban Ki-moon in 2017. The International Court of Justice (or ICJ), sometimes known as the World Court, is the primary judicial organ of the UN. It is the successor to the Permanent Court of International Justice and occupies

17374-540: The post-war world. At the subsequent meeting of the Inter-Allied Council in London on 24 September 1941, the eight governments in exile of countries under Axis occupation , together with the Soviet Union and representatives of the Free French Forces , unanimously adopted adherence to the common principles of policy set forth by Britain and the United States. Roosevelt and Churchill met at

17520-560: The presence of Russian troops in Iranian Azerbaijan and British forces in Greece . British diplomat Gladwyn Jebb served as interim secretary-general. The General Assembly selected New York City as the site for the headquarters of the UN. Construction began on 14 September 1948 and the facility was completed on 9 October 1952. The Norwegian Foreign Minister, Trygve Lie , was the first elected UN secretary-general . Though

17666-532: The previous four decades. Between 1988 and 2000, the number of adopted Security Council resolutions more than doubled, and the peacekeeping budget increased by more than tenfold. The UN negotiated an end to the Salvadoran Civil War , launched a successful peacekeeping mission in Namibia , and oversaw democratic elections in post- apartheid South Africa and post- Khmer Rouge Cambodia. In 1991,

17812-431: The production of atomic weapons from monitoring source mines for uranium . On March 16, 1946, the committee's report was presented to the State Department , which released it to the public on March 28. The Report on the International Control of Atomic Energy soon became known as the Acheson–Lilienthal Report . The primary message of the report was that control of atomic energy through inspections and policing operations

17958-509: The project comprised Chester Barnard , J. Robert Oppenheimer , Charles A. Thomas , Harry A. Winne, and David E. Lilienthal , while the official authors, who had worked on the Manhattan Project and included some of the United States' top scientists, comprised Luis Walter Alvarez , Robert F. Bacher , Manson Benedict , Hans Bethe , Arthur Compton , Farrington Daniels , J. Robert Oppenheimer, John R. Ruhoff, G. T. Seaborg , Frank Spedding , Charles A. Thomas, and Walter Zinn . The report itself

18104-407: The remainder of Czechoslovakia and subsequently split it into the German Protectorate of Bohemia and Moravia and a pro-German client state , the Slovak Republic . Hitler also delivered an ultimatum to Lithuania on 20 March 1939, forcing the concession of the Klaipėda Region , formerly the German Memelland . Greatly alarmed and with Hitler making further demands on the Free City of Danzig ,

18250-408: The rest of the 20th century and into the 21st century. The United Nations was established to foster international cooperation and prevent conflicts, with the victorious great powers—China, France, the Soviet Union, the UK, and the US—becoming the permanent members of its security council . The Soviet Union and the United States emerged as rival superpowers , setting the stage for the Cold War . In

18396-410: The significant territorial, colonial, and financial losses imposed by the Treaty of Versailles . Under the treaty, Germany lost around 13 percent of its home territory and all its overseas possessions , while German annexation of other states was prohibited, reparations were imposed, and limits were placed on the size and capability of the country's armed forces . The German Empire was dissolved in

18542-415: The strong Maginot Line fortifications on the Franco-German border, Germany directed its attack at the neutral nations of Belgium , the Netherlands , and Luxembourg . The Germans carried out a flanking manoeuvre through the Ardennes region, which was mistakenly perceived by the Allies as an impenetrable natural barrier against armoured vehicles. By successfully implementing new Blitzkrieg tactics,

18688-433: The wake of European devastation, the influence of its great powers waned, triggering the decolonisation of Africa and Asia . Most countries whose industries had been damaged moved towards economic recovery and expansion . World War II began in Europe on 1 September 1939 with the German invasion of Poland and the United Kingdom and France 's declaration of war on Germany two days later on 3 September 1939. Dates for

18834-401: The war included Japan's invasion of Manchuria , the Spanish Civil War , the outbreak of the Second Sino-Japanese War , and Germany's annexations of Austria and the Sudetenland . World War II is generally considered to have begun on 1 September 1939, when Nazi Germany , under Adolf Hitler , invaded Poland , prompting the United Kingdom and France to declare war on Germany. Poland

18980-407: The war were not fulfilled in the peace settlement. From 1922 to 1925, the Fascist movement led by Benito Mussolini seized power in Italy with a nationalist, totalitarian , and class collaborationist agenda that abolished representative democracy, repressed socialist, left-wing, and liberal forces, and pursued an aggressive expansionist foreign policy aimed at making Italy a world power, promising

19126-475: The war. Germany annexed western Poland and occupied central Poland ; the Soviet Union annexed eastern Poland ; small shares of Polish territory were transferred to Lithuania and Slovakia . On 6 October, Hitler made a public peace overture to the United Kingdom and France but said that the future of Poland was to be determined exclusively by Germany and the Soviet Union. The proposal was rejected and Hitler ordered an immediate offensive against France, which

19272-404: The west halted the German advance for several days, but it was outflanked and encircled by the Wehrmacht . Remnants of the Polish army broke through to besieged Warsaw . On 17 September 1939, two days after signing a cease-fire with Japan , the Soviet Union invaded Poland under the supposed pretext that the Polish state had ceased to exist. On 27 September, the Warsaw garrison surrendered to

19418-416: The widespread decolonization in the 1960s. Since then, 80 former colonies have gained independence, including 11 trust territories that had been monitored by the Trusteeship Council . By the 1970s, the UN's budget for economic and social development programmes vastly exceeded its spending on peacekeeping . After the end of the Cold War in 1991, the UN shifted and expanded its field operations, undertaking

19564-483: The world order , and soon began a massive rearmament campaign . France, seeking to secure its alliance with Italy, allowed Italy a free hand in Ethiopia , which Italy desired as a colonial possession. The situation was aggravated in early 1935 when the Territory of the Saar Basin was legally reunited with Germany, and Hitler repudiated the Treaty of Versailles, accelerated his rearmament programme, and introduced conscription. The United Kingdom, France and Italy formed

19710-404: The world stage. The office has evolved into a dual role of an administrator of the UN organization and a diplomat and mediator addressing disputes between member states and finding consensus to global issues . The secretary-general is appointed by the General Assembly, after being recommended by the Security Council, where the permanent members have veto power. There are no specific criteria for

19856-554: Was invaded by Germany. The United States started strategic planning to prepare for a full-scale offensive against Germany. At the end of September 1940, the Tripartite Pact formally united Japan, Italy, and Germany as the Axis powers . The Tripartite Pact stipulated that any country—with the exception of the Soviet Union—that attacked any Axis Power would be forced to go to war against all three. The Axis expanded in November 1940 when Hungary , Slovakia , and Romania joined. Romania and Hungary later made major contributions to

20002-420: Was divided between Germany and the Soviet Union under the Molotov–Ribbentrop Pact , in which they had agreed on " spheres of influence " in Eastern Europe. In 1940, the Soviets annexed the Baltic states and parts of Finland and Romania . After the fall of France in June 1940, the war continued mainly between Germany and the British Empire , with fighting in the Balkans , Mediterranean, and Middle East ,

20148-414: Was divided between the two positions. He was distrustful of the Soviet Union but still did not want to lead the world down a path to destruction. He continued to solicit views from both sides. Stimson resigned in September 1945, and thereafter, the task of promoting his approach fell primarily on Under Secretary of State and later Secretary of State Dean Acheson . A proposal to pass the responsibility for

20294-485: Was generally accepted at the time that the war ended with the armistice of 15 August 1945 ( V-J Day ), rather than with the formal surrender of Japan on 2 September 1945, which officially ended the war in Asia . A peace treaty between Japan and the Allies was signed in 1951. A 1990 treaty regarding Germany's future allowed the reunification of East and West Germany to take place and resolved most post–World War   II issues. No formal peace treaty between Japan and

20440-403: Was postponed until the spring of 1940 due to bad weather. After the outbreak of war in Poland, Stalin threatened Estonia , Latvia , and Lithuania with military invasion, forcing the three Baltic countries to sign pacts allowing the creation of Soviet military bases in these countries; in October 1939, significant Soviet military contingents were moved there. Finland refused to sign

20586-447: Was re-elected on 8 June 2021. The organization is financed by assessed and voluntary contributions from its member states. The UN, its officers, and its agencies have won multiple Nobel Peace Prizes , although other evaluations of its effectiveness have been contentious. Some commentators believe the organization to be a leader in peace and human development, while others have criticized it for ineffectiveness, bias, and corruption . In

20732-657: Was repulsed with heavy Italian casualties; the campaign ended within months with minor territorial changes. To assist Italy and prevent Britain from gaining a foothold, Germany prepared to invade the Balkans, which would threaten Romanian oil fields and strike against British dominance of the Mediterranean. In December 1940, British Empire forces began counter-offensives against Italian forces in Egypt and Italian East Africa . The offensives were successful; by early February 1941, Italy had lost control of eastern Libya, and large numbers of Italian troops had been taken prisoner. The Italian Navy also suffered significant defeats, with

20878-441: Was required to go through the bureaucracy of the League of Nations, which rendered it essentially toothless. The United States, concerned with events in Europe and Asia, passed the Neutrality Act in August of the same year. Hitler defied the Versailles and Locarno Treaties by remilitarising the Rhineland in March 1936, encountering little opposition due to the policy of appeasement . In October 1936, Germany and Italy formed

21024-399: Was the acquisition of sufficient fissile material. In response, the Acheson–Lilienthal Report proposed that the complete path from the uranium and thorium mines to post production be under international ownership. In addition, the report proposed that the United States abandon its monopoly on atomic weapons, revealing what it knew to the Soviet Union, in exchange for a mutual agreement against

21170-411: Was unlikely to succeed. Instead, the report proposed that all fissile material be owned by an international agency to be called the Atomic Development Authority , which would release small amounts to individual nations for the development of peaceful uses of atomic energy. In the first years of the atomic era, it was generally believed that the great obstacle facing a would-be developer of an atomic bomb

21316-519: Was written largely by Oppenheimer. World War II Asia-Pacific Mediterranean and Middle East Other campaigns Coups World War II or the Second World War (1 September 1939 – 2 September 1945) was a global conflict between two coalitions: the Allies and the Axis powers . Nearly all the world's countries —including all the great powers —participated, with many investing all available economic, industrial, and scientific capabilities in pursuit of total war , blurring

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