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121-571: Johns Hopkins Hospital is widely regarded as one of the world's greatest hospitals and medical institutions. For 21 consecutive years from 1991 to 2020, it was ranked as the best overall hospital in the United States by U.S. News & World Report . In its 2019–2020 edition, U.S. News & World Report ranked the hospital on 15 adult specialties and 10 children's specialties; the hospital came in 1st in Maryland and third nationally behind

242-561: A Carrara marble statue in the Billings Administration Building rotunda of the resurrected Jesus based on the 1833 original by Bertel Thorvaldsen , which was a gift by Baltimore merchant William Wallace Spence; it is a replica of the original by Danish sculptor Bertel Thorwaldsen in Copenhagen . Unveiled in 1896, the statue brings comfort to many, the hospital has said. In 1903, Harriet Lane left

363-577: 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

484-822: A medical degree from the University of Virginia School of Medicine in 1885 and later worked in New York City , Washington D.C. , and Baltimore , where he established the institute. Between 1930 and 1963, Helen B. Taussig , who helped to develop the blue baby operation, headed the pediatric cardiac clinic. Child psychiatrist Leo Kanner did studies of autistic children. Lawson Wilkins established an endocrine clinic that developed procedures used universally to treat children with certain glandular disorders, including dwarfism. John E. Bordley and William G. Hardy made strides in detecting hearing impairments in very young children. Medical achievements at Johns Hopkins include

605-580: 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

726-542: 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

847-534: 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

968-407: 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

1089-638: 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

1210-523: A hospital." He wished for a hospital that "shall, in construction and arrangement, compare favorably with any other institution of like character in this country or in Europe" and directed his trustees to "secure for the service of the Hospital, physicians and surgeons of the highest character and greatest skill." Hopkins instructed the trustees to "bear constantly in mind that it is my wish and purpose that

1331-648: A new medical institute on the Institute of the History of Medicine at the University of Leipzig . He returned to America in 1877 and opened a laboratory at Bellevue Medical College (now a part of New York University Medical School ). In 1884, he was the first physician recruited to be a professor at the newly forming Johns Hopkins Hospital and Medical School at Johns Hopkins University in Baltimore . By 1886, he had 16 graduate physicians working in his laboratory –

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1452-598: 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

1573-597: A pioneer treatment, teaching, and research clinic, and the first to have subspecialties in pediatrics as created by Edwards A. Park . In 1912, Diamond Jim Brady donated $ 220,000 to the hospital, which created the James Buchanan Brady Urological Institute. Ophthalmologist William Holland Wilmer opened the Wilmer Eye Institute at the hospital in 1925, and its building was completed four years later. Wilmer received

1694-923: A president of the National Academy of Sciences from 1913–1917. He also was president of the American Medical Association , the Association of American Physicians , the History of Science Society , the Congress of American Physicians and Surgeons, the Society of American Bacteriologists , and the Maryland State Board of Health. Welch was a founding editor of the Journal of Experimental Medicine . Welch served in

1815-488: 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

1936-526: 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,

2057-614: 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

2178-720: A staff of over 1,700 doctors with over 30,000 total employees. From 1982 to 1992, then CEO Robert Heyssel established the hospital's first Oncology Center, the Nelson Patient Tower, the Clayton Heart Center and the Johns Hopkins Outpatient Center which bears Heyssel's name. In May 2012, the Johns Hopkins Hospital opened two new towers as part of a major campus redevelopment effort. The opening of

2299-632: 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

2420-458: A success; those of us who were not enthusiastic at the beginning are now sympathetic and friendly." Osler, the first chief of the Department of Medicine, is credited with originating the idea of a residency, in which recently graduated physicians receive advanced training in their specialty while treating patients under supervision; then, as now, residents comprise most of the medical staff of

2541-488: A sum of over $ 400,000 at her death in 1903 to establish the Harriet Lane Home for Invalid Children as a memorial to two sons who had died in childhood. In October 1912 the Harriet Lane Home officially opened. It was the first children's clinic in the United States that was associated with a medical school, first run by John Howland . Eventually treating over 60,000 children a year, the Harriet Lane Home became

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2662-473: A true medical specialty . He created new surgical approaches to women's diseases and invented numerous medical devices, including a urinary cystoscope. He was one of the first to use radium to treat cancer, with his first patient being his own aunt in 1904, who died shortly after surgery. Kelly was known to use excessive amounts of radium to treat various cancers and tumors. As a result, some of his patients died from radium exposure. His method of radium application

2783-401: 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

2904-464: 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

3025-579: Is affiliated with the Johns Hopkins School of Medicine . The hospital is the flagship pediatric member of Johns Hopkins Medicine and is 1 of 2 children's hospital in the network. The hospital provides comprehensive pediatric specialties and subspecialties to infants, children, teens, and young adults aged 0–21 throughout Baltimore and the wider United States. Johns Hopkins Children's Center also sometimes treats adults that require pediatric care. Johns Hopkins Children's Center also features one of

3146-510: Is also named after Welch. In his lifetime, he was called the "Dean of American Medicine" and received various awards and honors throughout his lifetime and posthumously. He was born on April 8, 1850, to William Wickham Welch and Emeline Collin Welch in Norfolk, Connecticut . He had a long family history of physicians and surgeons, starting with his grandfather Benjamin Welch. Benjamin was also on

3267-591: 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

3388-498: 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,

3509-438: 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

3630-549: Is the discoverer of the organism that causes gas gangrene . It was named Clostridium welchii in recognition of that fact, but now the organism usually is designated as Clostridium perfringens . From 1901 to 1933, he was founding president of the Board of Scientific Directors at the Rockefeller Institute for Medical Research . He was an instrumental reformer of medical education in the United States, as well as

3751-552: 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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3872-603: 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

3993-553: 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

4114-549: 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

4235-500: 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

4356-720: 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

4477-719: 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

4598-633: The Institute of the History of Medicine at Johns Hopkins, which was established in October 1929. The new institute also built on the already existing Johns Hopkins Hospital Historical Club (est. 1890), of which Welch had been a co-founder. Welch is also the founding editor-in-chief of the American Journal of Epidemiology . Graduates of Welch's training programs were highly coveted as academic physicians. Medical schools and institutes across

4719-483: The Johns Hopkins School of Hygiene and Public Health , the first school of public health in the country. During this time, Welch was also involved in creating a new medical library for Johns Hopkins. He embarked on a sabbatical in Europe, where he visited the University of Leipzig's Institute and various other universities, as well as libraries and bookstores. These German institutions influenced Welch's design for

4840-567: The Mayo Clinic in Rochester, Minnesota and Massachusetts General Hospital in Boston . In 2021, the hospital marked 32 consecutive years of placing in the top five hospitals in the nation. The hospital's founding in 1889 was made possible from a philanthropic bequest of over $ 7 million by city merchant, banker, financier, civic leader, and philanthropist Johns Hopkins , which at the time

4961-596: 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

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5082-688: 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)

5203-596: 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

5324-778: 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,

5445-648: 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

5566-591: 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

5687-700: 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

5808-416: 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 ,

5929-413: 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

6050-400: 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

6171-406: 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

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6292-466: 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

6413-479: The 3-story, 100,000-square-foot (9,300 m) Pavilion III . Johns Hopkins also provides remote consultations worldwide through the Grand Round platform, and uses the same platform to help patients find the ideal specialist for their unique needs. Johns Hopkins Children's Center (JHCC) is a nationally ranked, pediatric acute care children's teaching hospital located in Baltimore, Maryland, adjacent to Johns Hopkins Hospital. The hospital has 196 pediatric beds and

6534-426: 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

6655-420: 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

6776-404: 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 ,

6897-458: 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

7018-465: 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

7139-476: 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

7260-451: 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

7381-661: 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

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7502-416: 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

7623-541: 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

7744-495: 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

7865-402: 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

7986-415: 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

8107-434: 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,

8228-478: 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

8349-509: 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

8470-417: The circular ward where bedside teaching occurred. He once said he hoped his tombstone would say only, "He brought medical students into the wards for bedside teaching." Halsted, the first chief of the Department of Surgery, established many other medical and surgical achievements at Johns Hopkins including modern surgical principles of control of bleeding, accurate anatomical dissection, complete sterility, and

8591-405: 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

8712-440: The country vied for Welch's former students and graduate scientists to fill top posts. Many of his residents went on to become highly prominent physicians, including Walter Reed , co-discoverer of the cause of yellow fever , Simon Flexner , founding director of the Rockefeller Institute for Medical Research , and future Nobel laureates George Whipple and Peyton Rous . Welch's research was principally in bacteriology , and he

8833-556: 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

8954-469: 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

9075-713: 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

9196-414: 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 ,

9317-580: 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

9438-541: 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

9559-664: The first male-to-female sex reassignment surgery in the United States that took place in 1966 at the Hopkins Gender Identity Clinic. Two of the most far-reaching advances in medicine during the last 25 years were also made at Hopkins. First, the Nobel Prize -winning discovery of restriction enzymes gave birth to the genetic engineering industry. Second, the discovery of the brain's natural opiates has triggered an explosion of interest in neurotransmitter pathways and functions. Other accomplishments of

9680-606: 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,

9801-513: The first postgraduate training program for physicians in the country. He helped the trustees recruit the other founding physicians for the hospital – William Stewart Halsted , William Osler , and Howard Kelly . Welch became head of the Department of Pathology when the hospital opened in 1889. In 1893, he also became the first dean of the Johns Hopkins University School of Medicine , and in 1916, he established and led

9922-441: The first radical mastectomy for breast cancer (before this time, such a diagnosis was a virtual death sentence). His other achievements included the introduction of the surgical glove and advances in thyroid , biliary tree , hernia , intestinal and arterial aneurysm surgeries. Halsted also established the first formal surgical residency training program in the United States. Kelly is credited with establishing gynecology as

10043-745: 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

10164-466: The hospital include the development of HeLa by George Otto Gey , head of tissue culture research in 1951, the first and arguably most important line of human cells grown in culture, identification of the three types of polio virus , and the first " blue baby " operation, which was done by surgeon Alfred Blalock in collaboration with Helen Taussig , a Hopkins graduate specializing in pediatric cardiology and surgical technician Vivien Thomas that opened

10285-475: The hospital included what was then state-of-the-art concepts in heating and ventilation to check the spread of disease. The trustees obtained the services of four outstanding physicians, known as the "Big Four," to serve as the founding staff of the hospital when it opened on May 7, 1889. They were pathologist William Henry Welch , surgeon William Stewart Halsted , internist William Osler , and gynecologist Howard Atwood Kelly . In 1893, Johns Hopkins University

10406-467: The hospital shall ultimately form a part of the Medical School of that university for which I have made ample provision in my will." By calling for this integral relationship between patient care, as embodied in the hospital, and teaching and research, as embodied in the university, Hopkins laid the groundwork for a revolution in American medicine. Johns Hopkins' vision, of two institutions in which

10527-459: The hospital. He also introduced the idea of bringing medical students into actual patient care early in their training; at the time medical school consisted almost entirely of lectures. Osler's contribution to practical education extends to the creation of " grand rounds ", the practice of leading physicians discussing the most difficult cases in front of assembled medical students, for the benefit of patients and students. The term “rounds” derives from

10648-463: 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

10769-500: The medical forefront of his time, establishing his county's medical association. William H. Welch was educated at Norfolk Academy and the Winchester Institute , a boarding school. His father and a grandfather and four of his uncles were all physicians. William Henry entered Yale University in 1866, where he studied Greek and classics. Initially, Welch was not interested in becoming a physician; his primary ambition

10890-482: 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

11011-612: 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

11132-662: 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

11253-725: The new $ 1.1 billion Charlotte R. Bloomberg Children's Center tower and the new Sheikh Zayed Tower marked the highpoint of this effort. In addition to the main hospital, the system operates four other hospitals and several outpatient care facilities in the Baltimore and Washington metro areas and All Children's Hospital in St. Petersburg, Florida. In May, 2019, the hospital completed an $ 80 million expansion project at its Green Spring Station campus in Brooklandville, Maryland , offering out-patient surgery, imaging, and oncology treatment at

11374-518: The only ACS verified Level 1 Pediatric Trauma Centers in the state. The hospital is directly attached to Johns Hopkins Hospital and is situated near the Ronald McDonald House of Maryland. Johns Hopkins Hospital was ranked as the top overall hospital in the United States for 21 consecutive years by U.S. News & World Report until 2012, when it moved to second place behind Massachusetts General Hospital in Boston . In 2013, it

11495-408: 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

11616-471: The practice of medicine would be wedded to medical research and medical education was revolutionary. Initial plans for the hospital were drafted by surgeon John Shaw Billings , and the architecture designed by John Rudolph Niernsee and completed by Edward Clarke Cabot of the Boston firm of Cabot and Chandler in a Queen Anne style . When completed in 1889 at a cost of $ 2,050,000 ( US$ 50.8 million in 2022),

11737-574: 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

11858-570: 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

11979-614: 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

12100-573: 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

12221-545: 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

12342-543: 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

12463-510: 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

12584-457: The time that it was made, Hopkins' gift was the largest philanthropic bequest in the history of the nation. Toward the end of his life, Hopkins selected 12 prominent Baltimore residents as trustees for the project. A year prior to his death, he sent each a letter telling them that he was giving "thirteen acres of land, situated in the city of Baltimore, and bounded by Broadway, Wolfe, Monument, and Jefferson streets upon which I desire you to erect

12705-470: The university. After several discussions, the trustees agreed to their terms and accepted the financial help of these four women with only one of the doctors, William H. Welch , resisting. Eventually, even Welch changed his views on coeducation, "The necessity for coeducation in some form," he wrote later, "becomes more evident the higher the character of the education. In no form of education is this more evident than in that of medicine ... we regard coeducation

12826-660: The way to modern cardiac surgery . Contributions to heart surgery were brought on by the discovery of heparin and the Blalock-Thomas-Taussig Shunt . Johns Hopkins has also published The Harriet Lane Handbook , an indispensable tool for pediatricians, for over 60 years. The hospital occupies approximately 20 of the 60 buildings on the Johns Hopkins Medical Campus. The complex has over 80 entrances and receives 80,000 visitors weekly. It houses over 1,000 beds and has

12947-582: 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

13068-583: 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

13189-513: 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

13310-444: 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

13431-553: 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

13552-565: 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". William H. Welch William Henry Welch (April 8, 1850 – April 30, 1934) was an American physician , pathologist , bacteriologist , and medical-school administrator. He

13673-575: 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

13794-759: 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

13915-583: 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

14036-507: Was inserting a radium capsule near the affected area, then sewing the radium "points" directly to the tumor . Welch was responsible for training many of the outstanding physicians of the day, such as Walter Reed . He also founded at Hopkins the nation's first Public Health school, now known as the Johns Hopkins Bloomberg School of Public Health . A notable sight at the hospital is the marble statue Christus ,

14157-505: Was one of the "Big Four" founding professors at the Johns Hopkins Hospital . He was the first dean of the Johns Hopkins School of Medicine and was also the founder of the Johns Hopkins School of Hygiene and Public Health , the first school of public health in the country. Welch was more known for his cogent summations of current scientific work, than his own scientific research. The Johns Hopkins medical school library

14278-443: Was one of the first medical schools to admit women. The decision to begin coeducation was a result of a shortage of funds, as the Baltimore and Ohio Railroad stock that was supposed to cover cost was used up in building the hospital in 1889 and the medical school had not yet been built. Four of the original trustees' daughters offered to raise the money needed to open the school, but only if the school agreed to admit qualified women to

14399-494: Was reinstated as the top hospital in the United States. In the 2016-2017 edition, Johns Hopkins ranks third-best nationally. Johns Hopkins School of Medicine and Johns Hopkins Hospital have faced criticism over ethics and research methodologies. United States The United States of America ( USA ), commonly known as the United States ( U.S. ) or America , is a country primarily located in North America . It

14520-561: Was the largest bequest in the history of the United States . The hospital is located at 600 North Broadway in Baltimore. Johns Hopkins (1795–1873), a Baltimore merchant and banker, left an estate of approximately $ 7 million ( US$ 173.84 million in 2022) when he died on December 24, 1873, in his city mansion on West Saratoga Street, just west of North Charles Street , at the age of 78. In his will, he asked that his fortune be used to found two institutions that would bear his name: " Johns Hopkins University " and "The Johns Hopkins Hospital." At

14641-905: Was to teach the Greek language. He received an AB degree in 1870. As an undergraduate, he joined the Skull and Bones fraternity. Welch remained a lifelong bachelor. He was the uncle of Senator Frederic C. Walcott . After a short period of teaching high-school students in Norwich, New York , Welch went to study medicine at the Columbia University College of Physicians and Surgeons , in Manhattan . In 1875, he received his MD. From 1876 to 1877, he studied at several German laboratories to work with, among others, Julius Cohnheim . This experience abroad prompted Welch to model his plans for

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