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United States of America The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territori ...
was created on July 4, 1776, with the U.S. Declaration of Independence of
thirteen British colonies The Thirteen Colonies, also known as the Thirteen British Colonies, the Thirteen American Colonies, or later as the United Colonies, were a group of British colonies on the Atlantic coast of North America. Founded in the 17th and 18th centuri ...
in
North America North America is a continent in the Northern Hemisphere and almost entirely within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the C ...
. In the
Lee Resolution The Lee Resolution (also known as "The Resolution for Independence") was the formal assertion passed by the Second Continental Congress on July 2, 1776 which resolved that the Thirteen Colonies in America (at the time referred to as United Co ...
two days prior, the colonies resolved that they were free and independent states. The union was formalized in the
Articles of Confederation The Articles of Confederation and Perpetual Union was an agreement among the 13 Colonies of the United States of America that served as its first frame of government. It was approved after much debate (between July 1776 and November 1777) by ...
, which
came into force In law, coming into force or entry into force (also called commencement) is the process by which legislation, regulations, treaties and other legal instruments come to have legal force and effect. The term is closely related to the date of thi ...
on March 1, 1781, after being ratified by all 13 states. Their independence was recognized by
Great Britain Great Britain is an island in the North Atlantic Ocean off the northwest coast of continental Europe. With an area of , it is the largest of the British Isles, the largest European island and the ninth-largest island in the world. It is ...
in the Treaty of Paris of 1783, which concluded the
American Revolutionary War The American Revolutionary War (April 19, 1775 – September 3, 1783), also known as the Revolutionary War or American War of Independence, was a major war of the American Revolution. Widely considered as the war that secured the independence of t ...
. This effectively doubled the size of the colonies, now able to stretch west past the Proclamation Line to the
Mississippi River The Mississippi River is the second-longest river and chief river of the second-largest drainage system in North America, second only to the Hudson Bay drainage system. From its traditional source of Lake Itasca in northern Minnesota, ...
. This land was organized into territories and then states, though there remained some conflict with the sea-to-sea grants claimed by some of the original colonies. In time, these grants were ceded to the federal government. The first great expansion of the country came with the
Louisiana Purchase The Louisiana Purchase (french: Vente de la Louisiane, translation=Sale of Louisiana) was the acquisition of the territory of Louisiana by the United States from the French First Republic in 1803. In return for fifteen million dollars, or appr ...
of 1803, which doubled the country's territory, although the southeastern border with
Spanish Florida Spanish Florida ( es, La Florida) was the first major European land claim and attempted settlement in North America during the European Age of Discovery. ''La Florida'' formed part of the Captaincy General of Cuba, the Viceroyalty of New Spain, ...
was the subject of much dispute until it and Spanish claims to the
Oregon Country Oregon Country was a large region of the Pacific Northwest of North America that was subject to a long dispute between the United Kingdom and the United States in the early 19th century. The area, which had been created by the Treaty of 181 ...
were ceded to the US in 1821. The Oregon Country gave the United States access to the
Pacific Ocean The Pacific Ocean is the largest and deepest of Earth's five oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean (or, depending on definition, to Antarctica) in the south, and is bounded by the conti ...
, though it was shared for a time with the
United Kingdom The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Europe, off the north-western coast of the continental mainland. It comprises England, Scotland, Wales and No ...
. The annexation of the
Republic of Texas The Republic of Texas ( es, República de Tejas) was a sovereign state in North America that existed from March 2, 1836, to February 19, 1846, that bordered Mexico, the Republic of the Rio Grande in 1840 (another breakaway republic from Me ...
in 1845 led directly to the
Mexican–American War The Mexican–American War, also known in the United States as the Mexican War and in Mexico as the (''United States intervention in Mexico''), was an armed conflict between the United States and Mexico from 1846 to 1848. It followed the 1 ...
, after which the victorious United States obtained the northern half of
Mexico Mexico ( Spanish: México), officially the United Mexican States, is a country in the southern portion of North America. It is bordered to the north by the United States; to the south and west by the Pacific Ocean; to the southeast by Gua ...
's territory, including what was quickly made the state of
California California is a state in the Western United States, located along the Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the most populous U.S. state and the 3rd largest by area. It is also the mo ...
. However, as the development of the country moved west, the question of
slavery Slavery and enslavement are both the state and the condition of being a slave—someone forbidden to quit one's service for an enslaver, and who is treated by the enslaver as property. Slavery typically involves slaves being made to perf ...
became more important, with vigorous debate over whether the new territories would allow slavery and events such as the
Missouri Compromise The Missouri Compromise was a federal legislation of the United States that balanced desires of northern states to prevent expansion of slavery in the country with those of southern states to expand it. It admitted Missouri as a slave state an ...
and
Bleeding Kansas Bleeding Kansas, Bloody Kansas, or the Border War was a series of violent civil confrontations in Kansas Territory, and to a lesser extent in western Missouri, between 1854 and 1859. It emerged from a political and ideological debate over the ...
. This came to a head in 1860 and 1861, when the governments of the southern states proclaimed their secession from the country and formed the
Confederate States of America The Confederate States of America (CSA), commonly referred to as the Confederate States or the Confederacy was an unrecognized breakaway republic in the Southern United States that existed from February 8, 1861, to May 9, 1865. The Confede ...
. The
American Civil War The American Civil War (April 12, 1861 – May 26, 1865; also known by other names) was a civil war in the United States. It was fought between the Union ("the North") and the Confederacy ("the South"), the latter formed by states ...
led to the defeat of the Confederacy in 1865 and the eventual readmission of the states to the
United States Congress The United States Congress is the legislature of the federal government of the United States. It is bicameral, composed of a lower body, the House of Representatives, and an upper body, the Senate. It meets in the U.S. Capitol in Washi ...
. The cultural endeavor and pursuit of
manifest destiny Manifest destiny was a cultural belief in the 19th-century United States that American settlers were destined to expand across North America. There were three basic tenets to the concept: * The special virtues of the American people and th ...
provided a strong impetus for westward expansion in the 19th century. The country began expanding beyond North America in 1856 with the passage of the
Guano Islands Act The Guano Islands Act (, enacted August 18, 1856, codified at §§ 1411-1419) is a United States federal law passed by the U.S. Congress that enables citizens of the United States to take possession, in the name of the United States, of unclaim ...
, causing many small and uninhabited, but economically important, islands in the Pacific Ocean and
Caribbean Sea The Caribbean Sea ( es, Mar Caribe; french: Mer des Caraïbes; ht, Lanmè Karayib; jam, Kiaribiyan Sii; nl, Caraïbische Zee; pap, Laman Karibe) is a sea of the Atlantic Ocean in the tropics of the Western Hemisphere. It is bounded by Mexico ...
to be claimed. Most of these claims were eventually abandoned, largely due to competing claims from other countries. The Pacific expansion culminated in the annexation of Hawaii in 1898, after the
overthrow Overthrow may refer to: * Overthrow, a change in government, often achieved by force or through a coup d'état. **The 5th October Overthrow, or Bulldozer Revolution, the events of 2000 that led to the downfall of Slobodan Milošević in the forme ...
of its government five years previously.
Alaska Alaska ( ; russian: Аляска, Alyaska; ale, Alax̂sxax̂; ; ems, Alas'kaaq; Yup'ik: ''Alaskaq''; tli, Anáaski) is a state located in the Western United States on the northwest extremity of North America. A semi-exclave of the U. ...
, the last major acquisition in North America, was purchased from Russia in 1867. Support for the independence of
Cuba Cuba ( , ), officially the Republic of Cuba ( es, República de Cuba, links=no ), is an island country comprising the island of Cuba, as well as Isla de la Juventud and several minor archipelagos. Cuba is located where the northern Caribbe ...
from the
Spanish Empire The Spanish Empire ( es, link=no, Imperio español), also known as the Hispanic Monarchy ( es, link=no, Monarquía Hispánica) or the Catholic Monarchy ( es, link=no, Monarquía Católica) was a colonial empire governed by Spain and its predece ...
, and the sinking of the USS Maine, led to the
Spanish–American War , partof = the Philippine Revolution, the decolonization of the Americas, and the Cuban War of Independence , image = Collage infobox for Spanish-American War.jpg , image_size = 300px , caption = (clo ...
in 1898, in which the United States gained
Guam Guam (; ch, Guåhan ) is an organized, unincorporated territory of the United States in the Micronesia subregion of the western Pacific Ocean. It is the westernmost point and territory of the United States (reckoned from the geographic cen ...
,
Puerto Rico Puerto Rico (; abbreviated PR; tnq, Boriken, ''Borinquen''), officially the Commonwealth of Puerto Rico ( es, link=yes, Estado Libre Asociado de Puerto Rico, lit=Free Associated State of Puerto Rico), is a Caribbean island and unincorporated ...
, and the
Philippines The Philippines (; fil, Pilipinas, links=no), officially the Republic of the Philippines ( fil, Republika ng Pilipinas, links=no), * bik, Republika kan Filipinas * ceb, Republika sa Pilipinas * cbk, República de Filipinas * hil, Republ ...
, and occupied Cuba for several years.
American Samoa American Samoa ( sm, Amerika Sāmoa, ; also ' or ') is an unincorporated territory of the United States located in the South Pacific Ocean, southeast of the island country of Samoa. Its location is centered on . It is east of the International ...
was acquired by the United States in 1900 after the end of the
Second Samoan Civil War The Second Samoan Civil War was a conflict that reached a head in 1898 when Germany, the United Kingdom, and the United States were locked in dispute over who should have control over the Samoan island chain, located in the South Pacific Oce ...
. The United States purchased the
U.S. Virgin Islands The United States Virgin Islands,. Also called the ''American Virgin Islands'' and the ''U.S. Virgin Islands''. officially the Virgin Islands of the United States, are a group of Caribbean islands and an unincorporated and organized territory ...
from Denmark in 1917. Guam and Puerto Rico remain territories; the Philippines became independent in 1946, after being a major theater of World War II. Following the war, many islands were entrusted to the U.S. by the
United Nations The United Nations (UN) is an intergovernmental organization whose stated purposes are to maintain international peace and security, develop friendly relations among nations, achieve international cooperation, and be a centre for harmonizi ...
, and while the
Northern Mariana Islands The Northern Mariana Islands, officially the Commonwealth of the Northern Mariana Islands (CNMI; ch, Sankattan Siha Na Islas Mariånas; cal, Commonwealth Téél Falúw kka Efáng llól Marianas), is an unincorporated territory and commonwe ...
remain a U.S. territory, the
Marshall Islands The Marshall Islands ( mh, Ṃajeḷ), officially the Republic of the Marshall Islands ( mh, Aolepān Aorōkin Ṃajeḷ),'' () is an independent island country and microstate near the Equator in the Pacific Ocean, slightly west of the Intern ...
,
Federated States of Micronesia The Federated States of Micronesia (; abbreviated FSM) is an island country in Oceania. It consists of four Administrative divisions of the Federated States of Micronesia#States, states from west to east, Yap State, Yap, Chuuk State, Chuuk, P ...
, and
Palau Palau,, officially the Republic of Palau and historically ''Belau'', ''Palaos'' or ''Pelew'', is an island country and microstate in the western Pacific. The nation has approximately 340 islands and connects the western chain of the Car ...
emerged from the trust territory as independent nations. The last major international change was the acquisition in 1904, and return to
Panama Panama ( , ; es, link=no, Panamá ), officially the Republic of Panama ( es, República de Panamá), is a List of transcontinental countries#North America and South America, transcontinental country spanning the Central America, southern ...
in 1979, of the
Panama Canal Zone The Panama Canal Zone ( es, Zona del Canal de Panamá), also simply known as the Canal Zone, was an unincorporated territory of the United States, located in the Isthmus of Panama, that existed from 1903 to 1979. It was located within the terr ...
, an unincorporated US territory which controlled the Panama Canal. The final cession of formal control over the region was made to Panama in 1999. Regarding internal borders, while territories could shift wildly in size, once established states have generally retained their initial borders. Only four states—
Maine Maine () is a state in the New England and Northeastern regions of the United States. It borders New Hampshire to the west, the Gulf of Maine to the southeast, and the Canadian provinces of New Brunswick and Quebec to the northeast and ...
,
Kentucky Kentucky ( , ), officially the Commonwealth of Kentucky, is a state in the Southeastern region of the United States and one of the states of the Upper South. It borders Illinois, Indiana, and Ohio to the north; West Virginia and Virgin ...
,
Vermont Vermont () is a U.S. state, state in the northeast New England region of the United States. Vermont is bordered by the states of Massachusetts to the south, New Hampshire to the east, and New York (state), New York to the west, and the Provin ...
, and
West Virginia West Virginia is a state in the Appalachian, Mid-Atlantic and Southeastern regions of the United States.The Census Bureau and the Association of American Geographers classify West Virginia as part of the Southern United States while the ...
—have been created from land claimed by another state; all of the others were created from territories or directly from acquisitions. Four states—
Louisiana Louisiana , group=pronunciation (French: ''La Louisiane'') is a state in the Deep South and South Central regions of the United States. It is the 20th-smallest by area and the 25th most populous of the 50 U.S. states. Louisiana is borde ...
,
Missouri Missouri is a state in the Midwestern region of the United States. Ranking 21st in land area, it is bordered by eight states (tied for the most with Tennessee): Iowa to the north, Illinois, Kentucky and Tennessee to the east, Arkansas to ...
,
Nevada Nevada ( ; ) is a state in the Western region of the United States. It is bordered by Oregon to the northwest, Idaho to the northeast, California to the west, Arizona to the southeast, and Utah to the east. Nevada is the 7th-most extensive, ...
, and
Pennsylvania Pennsylvania (; (Pennsylvania Dutch: )), officially the Commonwealth of Pennsylvania, is a state spanning the Mid-Atlantic, Northeastern, Appalachian, and Great Lakes regions of the United States. It borders Delaware to its southeast, ...
—have expanded significantly by acquiring additional federal territory after their initial
admission to the Union Admission may refer to: Arts and media * "Admissions" (''CSI: NY''), an episode of ''CSI: NY'' * ''Admissions'' (film), a 2011 short film starring James Cromwell * ''Admission'' (film), a 2013 comedy film * ''Admission'', a 2019 album by Florida s ...
. The last state of the
contiguous United States The contiguous United States (officially the conterminous United States) consists of the 48 adjoining U.S. states and the Federal District of the United States of America. The term excludes the only two non-contiguous states, Alaska and Hawai ...
, commonly called the "lower 48", was admitted in 1912; the fiftieth and most recent state was admitted in 1959.


Legend for maps

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1776–1784 (American Revolution)


1784–1803 (Organization of territory)


1803–1818 (Purchase of Louisiana)


1819–1845 (Northwest expansion)


1845–1860 (Southwest expansion)


1860–1865 (Civil War)


1866–1897 (Reconstruction and western statehood)


1898–1945 (Pacific and Caribbean expansion)


1946–present (Decolonization)


Bancos along the Rio Grande

The Banco Convention of 1905 between the United States and
Mexico Mexico ( Spanish: México), officially the United Mexican States, is a country in the southern portion of North America. It is bordered to the north by the United States; to the south and west by the Pacific Ocean; to the southeast by Gua ...
allowed, in the event of sudden changes in the course of the
Rio Grande The Rio Grande ( and ), known in Mexico as the Río Bravo del Norte or simply the Río Bravo, is one of the principal rivers (along with the Colorado River) in the southwestern United States and in northern Mexico. The length of the Rio G ...
(as by flooding), for the border to be altered to follow the new course. The sudden changes often created ''bancos'' (land surrounded by bends in the river that became segregated from either country by a cutoff, often due to rapid accretion or avulsion of the alluvial channel), especially in the Lower Rio Grande Valley. When these bancos are created, the
International Boundary and Water Commission The International Boundary and Water Commission ( es, links=no, Comisión Internacional de Límites y Aguas) is an international body created by the United States and Mexico in 1889 to apply the rules for determining the location of their intern ...
investigates if land previously belonging to the United States or
Mexico Mexico ( Spanish: México), officially the United Mexican States, is a country in the southern portion of North America. It is bordered to the north by the United States; to the south and west by the Pacific Ocean; to the southeast by Gua ...
is to be considered on the other side of the border. In all cases of these adjustments along the Rio Grande under the 1905 convention, which occurred on 37 different dates from 1910 to 1976, the transferred land was minuscule (ranging from one to 646 acres) and uninhabited.


See also

*
Geography of the United States The term 'United States', when used in the geographical sense, refers to the contiguous United States, the state of Alaska, the island state of Hawaii, the five insular territories of Puerto Rico, Northern Mariana Islands, U.S. Virgin Isl ...
*
Territories of the United States Territories of the United States are sub-national administrative divisions overseen by the federal government of the United States. The various American territories differ from the U.S. states and tribal reservations as they are not sover ...
*
Historic regions of the United States The territory of the United States and its overseas possessions has evolved over time, from the colonial era to the present day. It includes formally organized territories, proposed and failed states, unrecognized breakaway states, internation ...
*
American frontier The American frontier, also known as the Old West or the Wild West, encompasses the geography, history, folklore, and culture associated with the forward wave of American expansion in mainland North America that began with European colonial ...
*
List of U.S. state partition proposals Numerous state partition proposals have been put forward since the 1776 establishment of the United States that would partition an existing U.S. state or states so that a particular region might either join another state or create a new state ...
*
List of U.S. states by date of admission to the Union A state of the United States is one of the 50 constituent entities that shares its sovereignty with the federal government. Americans are citizens of both the federal republic and of the state in which they reside, due to the shared sovere ...
* Movements for the annexation of Canada to the United States * National Atlas of the United States *
Ostend Manifesto The Ostend Manifesto, also known as the Ostend Circular, was a document written in 1854 that described the rationale for the United States to purchase Cuba from Spain while implying that the U.S. should declare war if Spain refused. Cuba's anne ...
(annexation of Cuba) * List of territorial claims and designations in Colorado * Territorial evolution of Arizona *
Territorial evolution of California 240px, Spanish period: An enlargeable map of the United States after the Treaty of Paris in 1783. The following timeline traces the territorial evolution of California, the thirty-first state admitted to the United States of America, in ...
* Territorial evolution of Idaho * Territorial evolution of Montana *
Territorial evolution of Nevada 240px, An enlargeable map of the United States after the Treaty of Paris in 1789 240px, An enlargeable map of the United States after the Anglo-American Convention of 1818 240px, An enlargeable map of the United States after the Adams-Onís T ...
* Territorial evolution of New Mexico * Territorial evolution of North Dakota *
Territorial evolution of Oregon An enlargeable map of the United States after the Treaty of Paris in 1789 The following outline traces the territorial evolution of the U.S. state of Oregon. Outline *Historical territorial claims of Spain in the present state of Oregon: ...
* Territorial evolution of South Dakota * Territorial evolution of Utah * Territorial evolution of Washington * Territorial evolution of Wyoming *
Territories of the United States on stamps Territories of the United States on stamps discusses commemorative postal issues devoted to lands that have been ceded to the nation or purchased by treaty in conjunction with both war and peace. Thirteen states have been created from colonial t ...
* List of U.S.–Native American treaties, which indicates tribal land cessions


Notes


References


Further reading

* * * {{featured list Border-related lists Borders of the United States Borders of U.S. states Former regions and territories of the United States History of United States expansionism History of colonialism