123-511: The American Century is a characterization of the period since the middle of the 20th century as being largely dominated by the United States in political, economic, and cultural terms. It is comparable to the description of the period 1815–1914 as Britain's Imperial Century . The United States' influence grew throughout the 20th century, but became especially dominant after the end of World War II , when only two superpowers remained;
246-577: A lower house based on population; and the Senate , an upper house based on equal representation for each state. Federalism provides substantial autonomy to the 50 states, while the country's political culture promotes liberty , equality , individualism , personal autonomy , and limited government . One of the world's most developed countries , the United States has had the largest nominal GDP since about 1890 and accounted for over 15% of
369-580: A " Special Relationship " with the United Kingdom and strong ties with Canada , Australia , New Zealand , the Philippines , Japan , South Korea , Israel , and several European Union countries ( France , Italy , Germany , Spain , and Poland ). The U.S. works closely with its NATO allies on military and national security issues, and with countries in the Americas through
492-504: A February 17, 1941, Life magazine editorial urged the United States to forsake isolationism for a missionary's role, acting as the world's Good Samaritan and spreading democracy. He called upon the US to enter World War II to defend democratic values: Throughout the 17th century and the 18th century and the 19th century, this continent teemed with manifold projects and magnificent purposes. Above them all and weaving them all together into
615-537: A compromise provision permitting the president to raise four volunteer divisions, a power Wilson did not exercise. To persuade an uninterested populace to support the war and the draft, George Creel , a veteran of the newspaper industry, became the United States' official war propagandist. He set up the Committee on Public Information , which recruited 75,000 speakers, who made 750,000 four-minute speeches in 5,000 cities and towns across America. Creel later helped form
738-542: A coordinated, continent-wide military effort. Finally, deteriorating relations between the British military establishment and the colonists, relations that were already less than positive, set the stage for further distrust and dislike of British troops. Following their victory in the French and Indian War, Britain began to assert greater control over local colonial affairs, resulting in colonial political resistance ; one of
861-534: A decentralized government that operated until 1789. After the British surrender at the siege of Yorktown in 1781 American sovereignty was internationally recognized by the Treaty of Paris (1783), through which the U.S. gained territory stretching west to the Mississippi River, north to present-day Canada, and south to Spanish Florida . The Northwest Ordinance (1787) established the precedent by which
984-407: A few prominent industrialists , largely by their formation of trusts and monopolies to prevent competition. Tycoons led the nation's expansion in the railroad , petroleum , and steel industries. The United States emerged as a pioneer of the automotive industry . These changes were accompanied by significant increases in economic inequality , slum conditions , and social unrest , creating
1107-638: A founding member of the World Bank , Organization of American States , NATO , and the United Nations , as well as a permanent member of the UN Security Council . The first documented use of the phrase "United States of America" is a letter from January 2, 1776. Stephen Moylan , a Continental Army aide to General George Washington , wrote to Joseph Reed , Washington's aide-de-camp , seeking to go "with full and ample powers from
1230-640: A large and modernized farming industry and large industrial base. The United States dollar is the dominant world reserve currency under the Bretton Woods system . US systems were rooted in capitalist economic theory based on supply and demand, that is, production determined by customers' demands. The US was allied with the G7 major economies. US economic policy prescriptions were the "standard" reform packages promoted for crisis-wracked developing countries by Washington, DC–based international institutions such as
1353-598: A period of heightened, overt racism following Reconstruction, a time often called the nadir of American race relations . A series of Supreme Court decisions, including Plessy v. Ferguson , emptied the Fourteenth and Fifteenth Amendments of their force, allowing Jim Crow laws in the South to remain unchecked, sundown towns in the Midwest, and segregation in communities across the country , which would be reinforced by
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#17327838206041476-459: A policy of non-intervention , avoiding conflict while trying to broker a peace. President Woodrow Wilson later argued that the war was so important that the US had to have a voice in the peace conference. The United States was never formally a member of the Allies but entered the war in 1917 as a self-styled "Associated Power". Initially the United States had a small army, but, after the passage of
1599-488: A prominent leader in the early 1960s. The Great Society plan of President Lyndon Johnson 's administration resulted in groundbreaking and broad-reaching laws, policies and a constitutional amendment to counteract some of the worst effects of lingering institutional racism . The counterculture movement in the U.S. brought significant social changes, including the liberalization of attitudes toward recreational drug use and sexuality . It also encouraged open defiance of
1722-526: A sense of manifest destiny . The Missouri Compromise attempted to balance the desire of northern states to prevent the expansion of slavery into new territories with that of southern states to extend it, admitting Missouri as a slave state and Maine as a free state. It further prohibited slavery in all other lands of the Louisiana Purchase north of the 36°30′ parallel . As Americans expanded further into land inhabited by Native Americans,
1845-614: A sense of American identity as well. Men who otherwise never left their own colony now traveled across the continent to fight alongside men from decidedly different backgrounds but who were no less "American". British officers trained American officers for battle, most notably George Washington ; these officers would lend their skills and expertise to the colonists' cause during the American Revolutionary War to come. In addition, colonial legislatures and officials found it necessary to cooperate intensively in pursuit of
1968-632: A status solidified after its involvement in World War I . After Japan 's attack on Pearl Harbor in December 1941, the U.S. entered World War II . Its aftermath left the U.S. and the Soviet Union as the world's two superpowers and led to the Cold War , during which both countries struggled for ideological dominance and international influence . Following the Soviet Union's collapse and
2091-401: A year). Juvenile correctional facilities are operated by local or state governments and serve as longer-term placements for any minor adjudicated as delinquent and ordered by a judge to be confined. As of January 2023, the United States has the sixth-highest per capita incarceration rate in the world—531 people per 100,000 inhabitants—and the largest prison and jail population in
2214-591: Is believed to be the first widespread culture in the Americas. Over time, indigenous North American cultures grew increasingly sophisticated, and some, such as the Mississippian culture , developed agriculture , architecture , and complex societies . In the post-archaic period , the Mississippian cultures were located in the midwestern , eastern , and southern regions, and the Algonquian in
2337-498: Is known as the presidential system , in contrast to the parliamentary system , where the executive is part of the legislative body. Many countries around the world imitated this aspect of the 1789 Constitution of the United States , especially in the Americas. The Constitution is silent on political parties. However, they developed independently in the 18th century with the Federalist and Anti-Federalist parties. Since then,
2460-438: Is now the United States experienced conflicts with Native Americans, they also engaged in trade, exchanging European tools for food and animal pelts. Relations ranged from close cooperation to warfare and massacres. The colonial authorities often pursued policies that forced Native Americans to adopt European lifestyles, including conversion to Christianity. Along the eastern seaboard, settlers trafficked African slaves through
2583-552: Is the federal agency charged with addressing most environmental-related issues . The idea of wilderness has shaped the management of public lands since 1964, with the Wilderness Act . The Endangered Species Act of 1973 provides a way to protect threatened and endangered species and their habitats. The United States Fish and Wildlife Service implements and enforces the Act. In 2024, the U.S. ranked 34th among 180 countries in
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#17327838206042706-551: The Allies of World War I , helping to turn the tide against the Central Powers . In 1920, a constitutional amendment granted nationwide women's suffrage . During the 1920s and '30s, radio for mass communication and the invention of early television transformed communications nationwide. The Wall Street Crash of 1929 triggered the Great Depression , which President Franklin D. Roosevelt responded to with
2829-553: The Atlantic slave trade . The original Thirteen Colonies that would later found the United States were administered as possessions of Great Britain , and had local governments with elections open to most white male property owners . The colonial population grew rapidly, eclipsing Native American populations; by the 1770s, the natural increase of the population was such that only a small minority of Americans had been born overseas. The colonies' distance from Britain allowed for
2952-547: The Central Intelligence Agency . The cultural effect of the US, often known as Americanization , is seen in the influence on other countries of US music, TV, films, art, and fashion, as well as the desire for freedom of speech and other guaranteed rights its residents enjoy. US pop stars such as Elvis Presley , Michael Jackson , and Madonna have become global celebrities. Critics have condemned Luce's " jingoistic missionary zeal". Others have noted
3075-549: The Environmental Performance Index . The country joined the Paris Agreement on climate change in 2016 and has many other environmental commitments. The United States is a federal republic of 50 states and a separate federal capital district, Washington, D.C. It also asserts sovereignty over five unincorporated territories and several uninhabited island possessions . The U.S. is
3198-529: The European war . In 1940, the United States ranked 18th in terms of military power. The Neutrality Patrol had US destroyers fighting at sea, but no state of war had been declared by Congress. American public opinion remained isolationist. The 800,000-member America First Committee vehemently opposed any American intervention in the European conflict, even as the US sold military aid to the United Kingdom and
3321-500: The Federal Bureau of Investigation (FBI) and the U.S. Marshals Service have national jurisdiction and specialized duties, such as protecting civil rights , national security and enforcing U.S. federal courts ' rulings and federal laws. State courts conduct most civil and criminal trials, and federal courts handle designated crimes and appeals of state court decisions . There is no unified "criminal justice system" in
3444-720: The Great Lakes , Mississippi River and Gulf of Mexico . British colonization of the East Coast began with the Virginia Colony (1607) and Plymouth Colony (1620). The Mayflower Compact and the Fundamental Orders of Connecticut established precedents for representative self-governance and constitutionalism that would develop throughout the American colonies. While European settlers in what
3567-719: The Great Lakes region and along the Eastern Seaboard , while the Hohokam culture and Ancestral Puebloans inhabited the southwest . Native population estimates of what is now the United States before the arrival of European immigrants range from around 500,000 to nearly 10 million. Christopher Columbus began exploring the Caribbean for Spain in 1492, leading to Spanish-speaking settlements and missions from Puerto Rico and Florida to New Mexico and California . France established its own settlements along
3690-505: The IMF , World Bank and NATO . Pax Americana represents the relative peace in the Western world, resulting in part from the preponderance of power enjoyed by the United States of America starting around the middle of the 20th century. Although the term finds its primary utility in the late 20th century, it has been used in other times in the 20th century. Its modern connotations concern
3813-559: The International Monetary Fund (IMF), World Bank , as well as the US Treasury Department . The military of the United States was a naval-based advanced military with by far the highest military expenditure in the world. The United States Navy is the world's largest navy, with the largest number of aircraft carriers , bases all over the world (particularly in an incomplete "ring" bordering
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3936-596: The Midwest . At the same time, about one million French Canadians migrated from Quebec to New England . During the Great Migration , millions of African Americans left the rural South for urban areas in the North. Alaska was purchased from Russia in 1867. The Compromise of 1877 effectively ended Reconstruction and white supremacists took local control of Southern politics . African Americans endured
4059-688: The National Park Service and other agencies. About 28% of the country's land is publicly owned and federally managed, primarily in the Western States . Most of this land is protected , though some is leased for commercial use, and less than one percent is used for military purposes. Environmental issues in the United States include debates on non-renewable resources and nuclear energy , air and water pollution , biodiversity , logging and deforestation , and climate change . The U.S. Environmental Protection Agency (EPA)
4182-596: The New Deal , a series of sweeping programs and public works projects combined with financial reforms and regulations . All were intended to protect against future economic depressions. Initially neutral during World War II , the U.S. began supplying war materiel to the Allies of World War II in March 1941 and entered the war in December after the Empire of Japan 's attack on Pearl Harbor . The U.S. developed
4305-778: The Organization of American States and the United States–Mexico–Canada Free Trade Agreement . In South America, Colombia is traditionally considered to be the closest ally of the United States. The U.S. exercises full international defense authority and responsibility for Micronesia , the Marshall Islands , and Palau through the Compact of Free Association . It has increasingly conducted strategic cooperation with India , but its ties with China have steadily deteriorated. Since 2014,
4428-648: The Pentium microprocessor in accordance with Moore's law , rechargeable lithium-ion batteries , the first gene therapy trial, and cloning either emerged in the U.S. or were improved upon there. The Human Genome Project was formally launched in 1990, while Nasdaq became the first stock market in the United States to trade online in 1998. In the Gulf War of 1991, an American-led international coalition of states expelled an Iraqi invasion force that had occupied neighboring Kuwait . The September 11 attacks on
4551-536: The Selective Service Act , it drafted 2.8 million men, and, by summer 1918, was sending 10,000 fresh soldiers to France every day. The war ended in 1919 with the Treaty of Versailles . The United States then adopted a policy of isolationism , having refused to endorse the 1919 Versailles Treaty or formally enter the League of Nations . During the interwar period, economic protectionism took hold in
4674-591: The Spanish–American War . (The Philippines was granted full independence from the U.S. on July 4, 1946, following World War II. Puerto Rico and Guam have remained U.S. territories.) American Samoa was acquired by the United States in 1900 after the Second Samoan Civil War . The U.S. Virgin Islands were purchased from Denmark in 1917. The United States entered World War I alongside
4797-623: The United States ( U.S. ) or America , is a country primarily located in North America . It is a federal union of 50 states and a federal capital district, Washington, D.C. The 48 contiguous states border Canada to the north and Mexico to the south, with the states of Alaska to the northwest and the archipelagic Hawaii in the Pacific Ocean . The United States also asserts sovereignty over five major island territories and various uninhabited islands . The country has
4920-558: The United States federal government to raise a national army for service in World War I through conscription . It was envisioned in December 1916 and brought to President Woodrow Wilson 's attention shortly after the break in relations with Germany in February 1917. The Act itself was drafted by then-Captain (later Brigadier General) Hugh S. Johnson after the United States entered World War I by declaring war on Germany. The Act
5043-704: The Warsaw Pact states to the west, south and east). The US had the largest nuclear arsenal in the world during the first half of the Cold War, one of the largest armies in the world and one of the two largest air forces in the world. Its powerful military allies in Western Europe (the North Atlantic Treaty Organization states) had their own nuclear capabilities. The US also possessed a powerful global intelligence network in
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5166-700: The cotton gin made the institution increasingly profitable for Southern elites . This sectional conflict regarding slavery culminated in the American Civil War (1861–1865). Eleven slave states seceded and formed the Confederate States of America , while the other states remained in the Union . War broke out in April 1861 after the Confederates bombarded Fort Sumter . After
5289-467: The end of the Cold War in 1991, the U.S. emerged as the world's sole superpower , wielding significant geopolitical influence globally . The U.S. national government is a presidential constitutional federal republic and liberal democracy with three separate branches : legislative , executive , and judicial . It has a bicameral national legislature composed of the House of Representatives ,
5412-537: The fall of communism and the collapse of the Soviet Union , which marked the end of the Cold War and left the United States as the world's sole superpower . The 1990s saw the longest recorded economic expansion in American history , a dramatic decline in U.S. crime rates , and advances in technology . Throughout this decade, technological innovations such as the World Wide Web , the evolution of
5535-400: The global economy in 2023. It possesses by far the largest amount of wealth of any country and has the highest disposable household income per capita among OECD countries. The U.S. ranks among the world's highest in economic competitiveness , productivity , innovation , human rights , and higher education . Its hard power and cultural influence have a global reach. The U.S. is
5658-813: The 1775 Battles of Lexington and Concord , igniting the American Revolutionary War . At the Second Continental Congress , the colonies appointed George Washington commander-in-chief of the Continental Army , and created a committee that named Thomas Jefferson to draft the Declaration of Independence . Two days after passing the Lee Resolution to create an independent nation the Declaration
5781-520: The 2010s, political polarization in the country increased between liberal and conservative factions. This polarization was capitalized upon in the January 2021 Capitol attack , when a mob of insurrectionists entered the U.S. Capitol and sought to prevent the peaceful transfer of power in an attempted self-coup d'état . The United States is the world's third-largest country by total area behind Russia and Canada. The 48 contiguous states and
5904-497: The American Alliance for Labor and Democracy, with union leader Samuel Gompers as president, to win working-class support for the war and "unify sentiment in the nation". The AALD had branches in 164 cities, and many labor leaders went along although "rank-and-file working class support for the war remained lukewarm ...", and the campaign was ultimately unsuccessful. Many prominent Socialist leaders became pro-war, though
6027-596: The American West have an alpine climate . The climate is arid in the Southwest, Mediterranean in coastal California , and oceanic in coastal Oregon , Washington , and southern Alaska . Most of Alaska is subarctic or polar . Hawaii , the southern tip of Florida and U.S. territories in the Caribbean and Pacific are tropical . States bordering the Gulf of Mexico are prone to hurricanes, and most of
6150-420: The Declaration of Independence on July 4, 1776. The term "United States" and the initialism "U.S.", used as nouns or as adjectives in English, are common short names for the country. The initialism "USA", a noun, is also common. "United States" and "U.S." are the established terms throughout the U.S. federal government , with prescribed rules. In English, the term "America" rarely refers to topics unrelated to
6273-404: The District of Columbia occupy a combined area of 3,119,885 square miles (8,080,470 km ). The coastal plain of the Atlantic seaboard gives way to inland forests and rolling hills in the Piedmont plateau region. The Appalachian Mountains and the Adirondack massif separate the East Coast from the Great Lakes and the grasslands of the Midwest . The Mississippi River System ,
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#17327838206046396-458: The Elder concluded that major military resources needed to be devoted to North America to win the war against France. For the first time, the continent became one of the main theaters of what could be termed a " world war ". The British colonies' position as an integral part of the British Empire became more apparent during the war, with British military and civilian officials becoming a more significant presence in American life. The war increased
6519-465: The January 1863 Emancipation Proclamation , many freed slaves joined the Union army . The war began to turn in the Union's favor following the 1863 Siege of Vicksburg and Battle of Gettysburg , and the Confederacy surrendered in 1865 after the Union's victory in the Battle of Appomattox Court House . The Reconstruction era followed the war. After the assassination of President Abraham Lincoln , Reconstruction Amendments were passed to protect
6642-414: The Psalmist called a little lower than the angels". Only under the American Century can the world "come to life in any nobility of health and vigor". According to David Harvey , Luce believed "the power conferred was global and universal rather than territorially specific, so Luce preferred to talk of an American century rather than an empire". In the same article he called upon United States "to exert upon
6765-476: The Rocky Mountains, the Yellowstone Caldera , is the continent's largest volcanic feature. In 2021, the United States had 8% of global permanent meadows and pastures and 10% of cropland. With its large size and geographic variety, the United States includes most climate types. East of the 100th meridian , the climate ranges from humid continental in the north to humid subtropical in the south. The western Great Plains are semi-arid . Many mountainous areas of
6888-424: The Soviet Union through the Lend-Lease program. In the 1941 State of the Union address, known as the Four Freedoms speech, President Franklin D. Roosevelt made a break with the tradition of non-interventionism . He outlined the US role in helping allies already engaged in warfare. By August, President Roosevelt and British Prime Minister Winston Churchill had drafted the Atlantic Charter to define goals for
7011-451: The U.S. has become a key ally of Ukraine ; it has also provided the country with significant military equipment and other support in response to Russia's 2022 invasion . The president is the commander-in-chief of the United States Armed Forces and appoints its leaders, the secretary of defense and the Joint Chiefs of Staff . The Department of Defense , which is headquartered at the Pentagon near Washington, D.C., administers five of
7134-661: The U.S. territories." Despite disparate systems of confinement, four main institutions dominate: federal prisons , state prisons , local jails, and juvenile correctional facilities . Federal prisons are run by the Federal Bureau of Prisons and hold people who have been convicted of federal crimes, including pretrial detainees. State prisons, run by the official department of correction of each state, hold sentenced people serving prison time (usually longer than one year) for felony offenses. Local jails are county or municipal facilities that incarcerate defendants prior to trial; they also hold those serving short sentences (typically under
7257-414: The United States and the Soviet Union . After the dissolution of the Soviet Union in 1991, the United States remained the world's only superpower , and became the hegemon , or what some have termed a hyperpower. The term was coined by Time publisher Henry Luce to describe what he thought the role of the United States would be and should be during the 20th century. Luce, the son of a missionary, in
7380-416: The United States and the peaceful transfer of power , respectively. The Louisiana Purchase of 1803 from France nearly doubled the territory of the United States. Lingering issues with Britain remained , leading to the War of 1812 , which was fought to a draw. Spain ceded Florida and its Gulf Coast territory in 1819. In the late 18th century, American settlers began to expand westward , many with
7503-541: The United States entered the Cold War, where geopolitical tensions between the U.S. and the Soviet Union led the two countries to dominate world affairs . The U.S. utilized the policy of containment to limit the USSR's sphere of influence, and prevailed in the Space Race , which culminated with the first crewed Moon landing in 1969. Domestically, the U.S. experienced economic growth , urbanization , and population growth following World War II . The civil rights movement emerged, with Martin Luther King Jr. becoming
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#17327838206047626-495: The United States has operated as a de facto two-party system , though the parties in that system have been different at different times. The two main national parties are presently the Democratic and the Republican . The former is perceived as relatively liberal in its political platform while the latter is perceived as relatively conservative . In the American federal system , sovereign powers are shared between two levels of elected government: national and state. People in
7749-402: The United States in 2001 by the pan-Islamist militant organization al-Qaeda led to the war on terror , and subsequent military interventions in Afghanistan and Iraq . The cultural impact of the attacks was profound and long-lasting. The U.S. housing bubble culminated in 2007 with the Great Recession , the largest economic contraction since the Great Depression. Coming to a head in
7872-415: The United States of America to Spain" to seek assistance in the Revolutionary War effort. The first known public usage is an anonymous essay published in the Williamsburg newspaper, The Virginia Gazette , on April 6, 1776. By June 1776, the "United States of America" appeared in the Articles of Confederation and the Declaration of Independence . The Second Continental Congress adopted
7995-405: The United States to building the Panama Canal , creating the Panama Canal Zone . Interventionism found its formal articulation in the 1904 Roosevelt Corollary to the Monroe Doctrine , proclaiming a right for the United States to intervene anywhere in the Americas, a moment that underlined the emergent US regional hegemony . After the outbreak of World War I in 1914, the United States pursued
8118-434: The United States, despite the usage of "the Americas " as the totality of North and South America. "The States" is an established colloquial shortening of the name, used particularly from abroad; "stateside" is the corresponding adjective or adverb. The first inhabitants of North America migrated from Siberia across the Bering land bridge about 12,000 years ago; the Clovis culture , which appeared around 11,000 BC,
8241-478: The United States, except Iran , North Korea , and Bhutan . Though Taiwan does not have formal diplomatic relations with the U.S., it maintains close unofficial relations. The United States regularly supplies Taiwan with military equipment to deter potential Chinese aggression. Its geopolitical attention also turned to the Indo-Pacific when the United States joined the Quadrilateral Security Dialogue with Australia, India, and Japan. The United States has
8364-408: The United States, particularly as a result of the Smoot–Hawley Tariff Act which is credited by economists with the prolonging and worldwide propagation of the Great Depression . From 1934, trade liberalization began to take place through the Reciprocal Trade Agreements Act . With the onset of World War II in 1939, Congress loosened the Neutrality Acts of 1930s but remained opposed to entering
8487-509: The United States. The American prison system is largely heterogenous, with thousands of relatively independent systems operating across federal, state, local, and tribal levels. In 2023, "these systems [held] almost 2 million people in 1,566 state prisons, 98 federal prisons, 3,116 local jails, 1,323 juvenile correctional facilities, 181 immigration detention facilities, and 80 Indian country jails, as well as in military prisons , civil commitment centers, state psychiatric hospitals, and prisons in
8610-403: The War Department's decision-making. The great majority of black soldiers were employed only in labor functions, such as road-building and freight-handling. Only two black combat units were ultimately established – the 92nd and 93rd Infantry Divisions . Black Americans were entirely excluded from the United States Marine Corps and were consigned to menial labor in the United States Navy for
8733-427: The War, the Big Four powers (the United States, United Kingdom, the Soviet Union, and China) met to plan the post-war world. In an effort to maintain peace, the Allies formed the United Nations , which came into existence on October 24, 1945, and adopted the Universal Declaration of Human Rights in 1948, as a common standard for all member states. The United States worked closely with the United Kingdom to establish
8856-425: The armed services, and some 2.8 million had been drafted. This meant that more than half of the almost 4.8 million Americans who served in the armed forces were drafted. Due to the effort to incite a patriotic attitude, the World War I draft had a high success rate, with fewer than 350,000 men "dodging" the draft. Section 7 of the act provided that men would be "as far as practicable...grouped into units by States and
8979-488: The bill through Congress and administered the draft as the Provost Marshal General . A problem that came up in the writing of the bill and its negotiation through Congress was the desire of former President Theodore Roosevelt to assemble a volunteer force to go to Europe. President Wilson and others, including army officers, were reluctant to permit this for a variety of reasons. The final bill contained
9102-403: The case for the "American Century" fitting neatly between the US's late entry into World War I in 1917 and the inauguration of its 45th President in 2017. Other scholars, such as George Friedman , stipulate that the 21st century will be the U.S. century: "The twenty-first century will be the American century." United States The United States of America ( USA ), commonly known as
9225-457: The contiguous United States are in the State of California, about 84 miles (135 km) apart. At an elevation of 20,310 feet (6,190.5 m), Alaska's Denali is the highest peak in the country and continent. Active volcanoes are common throughout Alaska's Alexander and Aleutian Islands , and Hawaii consists of volcanic islands. The supervolcano underlying Yellowstone National Park in
9348-556: The country's GDP. The U.S. has 42% of the world's nuclear weapons —the second-largest share after Russia. The United States has the third-largest combined armed forces in the world, behind the Chinese People's Liberation Army and Indian Armed Forces . The military operates about 800 bases and facilities abroad, and maintains deployments greater than 100 active duty personnel in 25 foreign countries. State defense forces (SDFs) are military units that operate under
9471-469: The country's territory would expand with the admission of new states , rather than the expansion of existing states. The U.S. Constitution was drafted at the 1787 Constitutional Convention to overcome the limitations of the Articles. It went into effect in 1789, creating a federal republic governed by three separate branches that together ensured a system of checks and balances . George Washington
9594-524: The court's opinion were based primarily on Kneedler v. Lane , 45 Pa. 238, 252 (1863) and Vattel 's 1758 treatise The Law of Nations . After the signing of the armistice of November 11, 1918, the activities of the Selective Service System were rapidly curtailed. On March 31, 1919, all local, district, and medical advisory boards were closed, and on May 21, 1919, the last state headquarters closed operations. The Provost Marshal General
9717-713: The development of self-governance, and the First Great Awakening , a series of Christian revivals , fueled colonial interest in religious liberty . For a century, the American colonists had been providing their own troops and materiel in conflicts with indigenous peoples allied with Britain's colonial rivals , especially France, and the Americans had begun to develop a sense of self-defense and self-reliance separate from Britain. The French and Indian War (1754–1763) took on new significance for all North American colonists after Parliament under William Pitt
9840-414: The dispossession of native inhabitants . As more states were admitted , a North–South division over slavery led to the secession of the Confederate States of America , which fought states remaining in the Union in the 1861–1865 American Civil War . With the victory and preservation of the United States, slavery was abolished nationally . By 1900, the country had established itself as a great power ,
9963-490: The draft during the two calls of June 2 and September 12, 1917 – 9.6 percent of the total American pool for potential conscription. Draft board officials were told to tear off the lower left-hand corner of the Selective Service form of a black registrant, indicating his designation for segregated units. The August 1917 Houston Riot , when armed black soldiers fired upon Houston police and civilians, also affected
10086-736: The end of the 20th century and the American Century, most famously the late gonzo journalist Hunter S. Thompson who titled his 2003 autobiography Kingdom of Fear : Loathsome Secrets of a Star Crossed Child in the Last Days of the American Century . With the advent of the new millennium , critics from the University of Illinois stated that it was a matter of debate whether the US ;was losing its superpower status, especially in relation to China's rise . Other analysts have made
10209-580: The environment for labor unions to begin to flourish . This period eventually ended with the advent of the Progressive Era , which was characterized by significant reforms. Pro-American elements in Hawaii overthrew the Hawaiian monarchy ; the islands were annexed in 1898. That same year, Puerto Rico , the Philippines , and Guam were ceded to the U.S. by Spain after the latter's defeat in
10332-573: The expiration of his term of service by the payment of money or any other valuable thing whatsoever as consideration his release from military service or liability there to. During World War I, there were three registrations. The Selective Service Act was upheld by the United States Supreme Court in the Selective Draft Law Cases , 245 U.S. 366 (1918). The Solicitor General 's argument and
10455-541: The federal government often applied policies of Indian removal or assimilation . The Trail of Tears (1830–1850) was a U.S. government policy that forcibly removed and displaced most Native Americans living east of the Mississippi River to lands far to the west. These and earlier organized displacements prompted a long series of American Indian Wars west of the Mississippi. The Republic of Texas
10578-606: The first nuclear weapons and used them against the Japanese cities of Hiroshima and Nagasaki in August 1945, ending the war. The United States was one of the " Four Policemen " who met to plan the post-war world , alongside the United Kingdom , Soviet Union , and China . The U.S. emerged relatively unscathed from the war, with even greater economic power and international political influence . After World War II,
10701-665: The first settlement of the Thirteen Colonies in Virginia in 1607. Clashes with the British Crown over taxation and political representation sparked the American Revolution , with the Second Continental Congress formally declaring independence on July 4, 1776. Following its victory in the 1775–1783 Revolutionary War , the country continued to expand westward across North America , resulting in
10824-610: The growth of the Army to 165,000 and the National Guard to 450,000 by 1921, but by 1917 the Army had only expanded to around 121,000, with the National Guard numbering 181,000. By 1916, it had become clear that any participation by the United States in the conflict in Europe would require a far larger army. While President Wilson at first wished to use only volunteer troops, it soon became clear that this would be impossible. When war
10947-463: The integration of Army National Guard units and personnel into the U.S. Army and (since 1947) the U.S. Air Force. There are about 18,000 U.S. police agencies from local to national level in the United States. Law in the United States is mainly enforced by local police departments and sheriff departments in their municipal or county jurisdictions. The state police departments have authority in their respective state , and federal agencies such as
11070-566: The majority did not. By the guidelines set down by the Selective Service Act, all males aged 21 to 30 were required to register to potentially be selected for military service. At the request of the War Department, Congress amended the law in August 1918 to expand the age range to include all men 18 to 45, and to bar further volunteering. By the end of World War I, some two million men volunteered for various branches of
11193-482: The military draft (leading to the end of conscription in 1973) and wide opposition to U.S. intervention in Vietnam (with the U.S. totally withdrawing in 1975). A societal shift in the roles of women was significantly responsible for the large increase in female paid labor participation during the 1970s, and by 1985 the majority of American women aged 16 and older were employed. The late 1980s and early 1990s saw
11316-612: The most attractive to the population are the most vulnerable. The U.S. is one of 17 megadiverse countries containing large numbers of endemic species : about 17,000 species of vascular plants occur in the contiguous United States and Alaska, and over 1,800 species of flowering plants are found in Hawaii, few of which occur on the mainland. The United States is home to 428 mammal species, 784 birds, 311 reptiles, 295 amphibians , and around 91,000 insect species. There are 63 national parks , and hundreds of other federally managed parks, forests, and wilderness areas , managed by
11439-411: The most exciting flag of all the world and of all history was the triumphal purpose of freedom. It is in this spirit that all of us are called, each to his own measure of capacity, and each in the widest horizon of his vision, to create the first great American Century. Democracy and other American ideals would "do their mysterious work of lifting the life of mankind from the level of the beasts to what
11562-662: The most violent, the California genocide of thousands of Native inhabitants, lasted into the early 1870s, just as additional western territories and states were created. During the colonial period, slavery had been legal in the American colonies , though the practice began to be significantly questioned during the American Revolution. States in the North enacted abolition laws , though support for slavery strengthened in Southern states , as inventions such as
11685-596: The navy, the " Great White Fleet ". When Theodore Roosevelt became president in 1901, he accelerated a foreign policy shift away from isolationism and towards foreign involvement, a process which had begun under his predecessor William McKinley . For instance, the United States fought the Philippine–American War against the First Philippine Republic to solidify its control over the newly acquired Philippines. In 1904, Roosevelt committed
11808-401: The peace established after the end of World War II in 1945. The American Century existed through the Cold War and demonstrated the status of the United States as the foremost of the world's two superpowers. After the Cold War, the most common belief held that only the United States fulfilled the criteria to be considered a superpower. Its geographic area composed the fourth-largest state in
11931-408: The policy of redlining later adopted by the federal Home Owners' Loan Corporation . An explosion of technological advancement accompanied by the exploitation of cheap immigrant labor led to rapid economic expansion during the late 19th and early 20th centuries , allowing the United States to outpace the economies of England, France, and Germany combined. This fostered the amassing of power by
12054-538: The political influence of the United States but also its economic influence. Many states around the world would, over the course of the 20th century, adopt the economic policies of the Washington Consensus , sometimes against the wishes of their populations. The economic force of the US was powerful at the end of the century due to it being by far the largest economy in the world . The US had large resources of minerals, energy resources, metals, and timber,
12177-532: The political subdivisions of the same," the most prominent example being the " National Army " infantry divisions. The most important difference between the draft established by the Selective Service Act of 1917 and the Civil War draft was that substitutes were not allowed. During the Civil War , a drafted man could avoid service by hiring another man to serve in his place. A mostly inaccurate perception spread that substitutes were used primarily by wealthy men and
12300-488: The post-war world. In December 1941, Japan attacked American and British territories with near-simultaneous offensives against Southeast Asia and the Central Pacific including an attack on the US fleet at Pearl Harbor . These attacks led the United States and United Kingdom to declare war on Japan . Three days later, Germany and Italy declared war on the United States, which the United States reciprocated. During
12423-574: The primary colonial grievances was a denial of their rights as Englishmen , particularly the right to representation in the British government that taxed them . To demonstrate their dissatisfaction and resolve, the First Continental Congress met in 1774 and passed the Continental Association , a colonial boycott of British goods that proved effective. The British attempt to then disarm the colonists resulted in
12546-570: The rights of African Americans . National infrastructure, including transcontinental telegraph and railroads , spurred growth in the American frontier . From 1865 through 1917 an unprecedented stream of immigrants arrived in the United States, including 24.4 million from Europe. Most came through the port of New York City , and New York City and other large cities on the East Coast became home to large Jewish , Irish , and Italian populations, while many Germans and Central Europeans moved to
12669-614: The rocky Great Basin and Chihuahua , Sonoran , and Mojave deserts. In the northwest corner of Arizona , carved by the Colorado River over millions of years, is the Grand Canyon , a steep-sided canyon and popular tourist destination known for its overwhelming visual size and intricate, colorful landscape. The Sierra Nevada and Cascade mountain ranges run close to the Pacific coast . The lowest and highest points in
12792-573: The six service branches, which are made up of the U.S. Army , Marine Corps , Navy , Air Force , and Space Force . The Coast Guard is administered by the Department of Homeland Security in peacetime and can be transferred to the Department of the Navy in wartime. The United States spent $ 916 billion on its military in 2023, which is by far the largest amount of any country , making up 37% of global military spending and accounting for 3.4% of
12915-545: The sole authority of a state government. SDFs are authorized by state and federal law but are under the command of the state's governor . They are distinct from the state's National Guard units in that they cannot become federalized entities. A state's National Guard personnel, however, may be federalized under the National Defense Act Amendments of 1933 , which created the Guard and provides for
13038-543: The states are also represented by local elected governments , which are administrative divisions of the states. States are subdivided into counties or county equivalents , and further divided into municipalities . The District of Columbia is a federal district containing the U.S. capital, Washington, D.C. . The federal district is an administrative division of the federal government. Federally recognized tribes govern 326 Indian reservations . The United States has an established structure of foreign relations, and it has
13161-510: The structure and responsibilities of the national federal government and its relationship with the individual states. The U.S. Constitution is the world's oldest national constitution still in effect (from March 4, 1789). Composed of three branches, all headquartered in Washington, D.C., the federal government is the national government of the United States. It is regulated by a strong system of checks and balances . The three-branch system
13284-470: The time of World War I. While the Army had several regiments of black " Buffalo Soldiers ", many politicians such as Sen. James K. Vardaman (Mississippi) and Sen. Benjamin Tillman (South Carolina) staunchly opposed any expanded military role for black Americans. Nevertheless, the War Department decided to include black people in the draft. A total of 2,290,527 black Americans were ultimately registered for
13407-841: The world , with an area of approximately 9.37 million km. The population of the US was 248.7 million in 1990, at that time the fourth-largest nation. In the mid-to-late 20th century, the political status of the US was defined as a strongly capitalist federation and constitutional republic. It had a permanent seat on the United Nations Security Council plus two allies with permanent seats, the United Kingdom and France . The US had strong ties with capitalist Western Europe, Latin America, British Commonwealth , and several East Asian countries ( Korea , Taiwan , Japan ). It allied itself with both right-wing dictatorships and capitalist democracies. The American Century includes
13530-629: The world the full impact of our influence, for such purposes as we see fit and by such means as we see fit". Beginning at the end of the 19th century, with the Spanish–American War in 1898 and the Boxer Rebellion , the United States began to play a more prominent role in the world beyond the North American continent. The government adopted protectionism after the Spanish–American War to develop its native industry and built up
13653-582: The world's fourth-longest river system , runs predominantly north–south through the heart of the country. The flat and fertile prairie of the Great Plains stretches to the west, interrupted by a highland region in the southeast. The Rocky Mountains , west of the Great Plains, extend north to south across the country, peaking at over 14,000 feet (4,300 m) in Colorado . Farther west are
13776-536: The world's second-largest diplomatic corps as of 2024 . It is a permanent member of the United Nations Security Council , and home to the United Nations headquarters . The United States is a member of the G7 , G20 , and OECD intergovernmental organizations. Almost all countries have embassies and many have consulates (official representatives) in the country. Likewise, nearly all countries host formal diplomatic missions with
13899-513: The world's third-largest land area , largest exclusive economic zone , and third-largest population , exceeding 334 million. Its three largest metropolitan areas are New York , Los Angeles , and Chicago , and its three most populous states are California , Texas , and Florida . Paleo-Indians migrated across the Bering land bridge more than 12,000 years ago, and formed various civilizations and societies . British colonization led to
14022-444: The world's oldest surviving federation, and its presidential system of national government has been adopted, in whole or in part, by many newly independent states worldwide following their decolonization . It is a liberal representative democracy "in which majority rule is tempered by minority rights protected by law ". The Constitution of the United States serves as the country's supreme legal document , also establishing
14145-553: The world's tornadoes occur in the country , mainly in Tornado Alley . Overall, the United States receives more high-impact extreme weather incidents than any other country. Extreme weather became more frequent in the U.S. in the 21st century, with three times the number of reported heat waves as in the 1960s. In the American Southwest , droughts became more persistent and more severe. The regions considered as
14268-575: The world, with almost 2 million people incarcerated . An analysis of the World Health Organization Mortality Database from 2010 showed U.S. homicide rates "were 7 times higher than in other high-income countries, driven by a gun homicide rate that was 25 times higher". Selective Service Act of 1917 The Selective Service Act of 1917 or Selective Draft Act ( Pub. L. 65–12 , 40 Stat. 76 , enacted May 18, 1917 ) authorized
14391-575: Was annexed in 1845, and the 1846 Oregon Treaty led to U.S. control of the present-day American Northwest . Victory in the Mexican–American War resulted in the 1848 Mexican Cession of California, Nevada, Utah, and much of present-day Colorado and the American Southwest . The California gold rush of 1848–1849 spurred a huge migration of white settlers to the Pacific coast, leading to even more confrontations with Native populations. One of
14514-759: Was adopted on July 4, 1776. The political values of the American Revolution included liberty , inalienable individual rights ; and the sovereignty of the people ; supporting republicanism and rejecting monarchy , aristocracy , and all hereditary political power; civic virtue ; and vilification of political corruption . The Founding Fathers of the United States , who included Washington, Jefferson, John Adams , Benjamin Franklin , Alexander Hamilton , John Jay , James Madison , Thomas Paine , and many others, were inspired by Greco-Roman , Renaissance , and Enlightenment philosophies and ideas. The Articles of Confederation were ratified in 1781 and established
14637-627: Was canceled with the end of the war on November 11, 1918. The Act was upheld as constitutional by the United States Supreme Court in 1918. At the time of World War I, the US Army was small compared with the mobilized armies of the European powers. As late as 1914, the Regular Army had under 100,000 men, while the National Guard (the organized militias of the states) numbered around 115,000. The National Defense Act of 1916 authorized
14760-658: Was declared, Wilson asked for the Army to increase to a force of one million. But by six weeks after war was declared, only 73,000 men had volunteered for service. Wilson accepted the recommendation of Secretary of War Newton D. Baker for a draft. General Enoch H. Crowder , the Judge Advocate General of the United States Army , when first consulted, was opposed. But later, with the assistance of Captain Hugh Johnson and others, Crowder guided
14883-583: Was elected the country's first president under the Constitution, and the Bill of Rights was adopted in 1791 to allay skeptics' concerns about the power of the more centralized government. His resignation as commander-in-chief after the Revolutionary War and his later refusal to run for a third term as the country's first president established a precedent for the supremacy of civil authority in
15006-413: Was relieved from duty on July 15, 1919, thereby finally terminating the activities of the Selective Service System of World War I. Conscription was by class. The first candidates were to be drawn from Class I. Members of each class below Class I were available only if the pool of all available and potential candidates in the class above it were exhausted. The American military was entirely segregated at
15129-570: Was resented by those who could not afford them or considered them dishonorable. The practice of substitutes was prohibited in Section Three of the Selective Service Act of 1917: No person liable to military service shall hereafter be permitted or allowed to furnish a substitute for such service; nor shall any substitute be received, enlisted, or enrolled in the military service of the United States; and no such person shall be permitted to escape such service or to be discharged therefrom prior to
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