La primera gran expansión del país llegó con la Compra de Luisiana de 1803, que duplicó el territorio del país, aunque la frontera sureste con la Florida española fue objeto de mucha disputa hasta que ésta y las reclamaciones españolas sobre el Territorio de Oregón fueron cedidas a los EE. UU. en 1821. El Territorio de Oregón dio a los Estados Unidos acceso al Océano Pacífico , aunque fue compartido por un tiempo con el Reino Unido . [2] La anexión de la República de Texas en 1845 condujo directamente a la Guerra México-Estadounidense , después de la cual los victoriosos Estados Unidos obtuvieron la mitad norte del territorio de México , incluido lo que rápidamente se convirtió en el estado de California . [3]
Sin embargo, a medida que el desarrollo del país se desplazaba hacia el oeste, la cuestión de la esclavitud adquirió mayor importancia, con un intenso debate sobre si los nuevos territorios permitirían la esclavitud y acontecimientos como el Compromiso de Misuri y el Kansas sangrante . Esto llegó a un punto crítico en 1860 y 1861, cuando los gobiernos de los estados del sur proclamaron su secesión del país y formaron los Estados Confederados de América . La Guerra Civil estadounidense condujo a la derrota de la Confederación en 1865 y a la eventual readmisión de los estados en el Congreso de los Estados Unidos . El esfuerzo cultural y la búsqueda del destino manifiesto proporcionaron un fuerte impulso a la expansión hacia el oeste en el siglo XIX.
Estados Unidos comenzó a expandirse más allá de América del Norte en 1856 con la aprobación de la Ley de las Islas Guano , lo que provocó que muchas islas pequeñas y deshabitadas, pero económicamente importantes, en el mar Caribe y el océano Pacífico fueran reclamadas. [4] La mayoría de estas reclamaciones fueron finalmente abandonadas, en gran parte debido a las reclamaciones competitivas de otros países. La expansión del Pacífico culminó con la anexión de Hawái en 1898, después del derrocamiento de su gobierno cinco años antes. Alaska , la última adquisición importante en América del Norte, fue comprada a Rusia en 1867. El apoyo a la independencia de Cuba del Imperio español y el hundimiento del USS Maine llevaron a la Guerra Hispano-Estadounidense en 1898, en la que Estados Unidos ganó Puerto Rico , Guam y las Filipinas , y ocupó Cuba durante varios años. Samoa Americana fue adquirida por Estados Unidos en 1900 después del final de la Segunda Guerra Civil Samoana . [5] Estados Unidos compró las Islas Vírgenes de los Estados Unidos a Dinamarca en 1917. [6] Puerto Rico y Guam siguen siendo territorios, y Filipinas se independizó en 1946, después de ser un importante teatro de operaciones de la Segunda Guerra Mundial .
Los estados generalmente han conservado sus fronteras iniciales una vez establecidos. Solo tres estados ( Kentucky , Maine y Virginia Occidental ) se han creado directamente a partir de área perteneciente a otro estado (aunque en el momento de la admisión, Vermont aceptó un pago monetario para que Nueva York renunciara a su reclamo); todos los demás estados se crearon a partir de territorios federales o de adquisiciones. Cuatro estados ( Luisiana , Misuri , Nevada y Pensilvania ) se han expandido sustancialmente al adquirir territorio federal adicional después de su admisión inicial a la Unión . En 1912, Arizona fue el último estado establecido en los Estados Unidos contiguos , comúnmente llamados los "48 inferiores". En 1959, Hawái fue el quincuagésimo y más reciente estado admitido.
Leyenda para mapas
Clave para los colores del mapa
Estados de los Estados Unidos (mapas nacionales), área no disputada de los Estados Unidos (mapas en disputa)
Territorios de los Estados Unidos (mapas nacionales)
zona en disputa de Estados Unidos
área cambiada por evento
1776–1784 (Revolución estadounidense)
1784–1803 (Organización del territorio)
1803–1818 (Compra de Luisiana)
1819–1845 (expansión al noroeste)
1845–1860 (expansión al suroeste)
1860–1865 (Guerra Civil)
1866–1897 (Reconstrucción y estadidad occidental)
1898–1945 (Expansión al Pacífico y al Caribe)
1946-presente (Descolonización)
Bancos along the Rio Grande
The Banco Convention of 1905 between the United States and Mexico allowed, in the event of sudden changes in the course of the Rio Grande (as by flooding), for the border to be altered to follow the new course.[455] 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 investigates if land previously belonging to the United States or Mexico is to be considered on the other side of the border.[456] 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.[457][458][459]
See also
Wikimedia Commons has media related to Maps of the territorial evolution of the United States.
^The borders of the country followed the colonial borders; for simplicity, the maps use the borders defined in the 1783 Treaty of Paris. The only substantive difference between the borders before and after the Treaty of Paris is the southwest border: when Great Britain had ownership over West Florida, they had moved its border north, to a line east from the mouth of the Yazoo River, and that area thus did not belong to Georgia; the treaty granted the area between this and 31° north to the United States.
^The New Hampshire towns petitioning to join Vermont were: Apthorp (now Littleton), Bath, Canaan, Cardigan (now Orange), Cornish, Dresden (now part of Hanover), Enfield, Franconia, Gunthwaite (now Lisbon), Haverhill, Landaff, Lebanon, Lyman, Lyme, Orford, and Piermont.[35] The specific extent of the towns annexed is unknown, as township borders were often delineated only when a dispute arose; the map uses the common interpretation.
^The New York towns petitioning to join Vermont were: "Black-Creek" (unknown; possibly is or is near Hebron), Cambridge, Fort Edward, Granville, "Greenfield" (unknown; there is a town named Greenfield but it lies west of the Hudson River, which was explicitly the western extent of the West Union), Hoosick, Kingsbury, "Little Hoosack" (unknown; presumably near Hoosick), Saratoga, "Scorticook" (possibly Schaghticoke), Skeensborough (now Whitehall), and "Upper-White-Creek" (probably White Creek).[42] The specific extent of the towns annexed is unknown, as township borders were often delineated only when a dispute arose; the map uses the common interpretation.
^The treaty established the boundaries of the new country, from the Bay of Fundy: up the "St. Croix River" (which river this referred to was disputed) to its source; north to the height of the land (the "Northwest Angle of Nova Scotia"); along the height of the land to the "northwesternmost Head" of the Connecticut River (which source this referred to was disputed); down that to 45° north; west to the St. Lawrence River; up that to the Great Lakes, through Lake Ontario, the Niagara River, Lake Erie, the Detroit River, Lake St. Clair, the St. Clair River, Lake Huron, and Lake Superior; to "Long Lake" (which lake this referred to was disputed) towards the Lake of the Woods; to the northwest angle of the Lake of the Woods; then west to the Mississippi River. However, the Lake of the Woods was north of the source of the Mississippi River; maps universally show this undefined border as a straight line, nearly straight south, between the two points. From there, it followed the Mississippi River down to 31° north; east to the Chattahoochee River; down that to the confluence of the Chattahoochee and Flint rivers; a line from there to the source of the St. Mary's River; then down that to the Atlantic Ocean.[51]
^The boundaries of Frankland were never defined; the map uses the common depiction of it.
^Massachusetts's ceded claim was a strip of land west of New York and Pennsylvania stretching to the Mississippi River, bounded by the latitudes of Massachusetts Bay Colony's original charter: on the north by a line west from one league north of Lake Winnipesaukee, and on the south by a line west from Massachusetts' southwest corner.[45]
^Connecticut's ceded claim was a strip of land west of 120 miles west of Pennsylvania (the western border of its Western Reserve) stretching to the Mississippi River, bounded by 41° north and the southern edge of Massachusetts's western claim, roughly 42°2′ north.[45]
^Massachusetts's ceded claim was the portion of New York 82 miles west of where the Delaware River left New York, to an unclear western boundary, with one source saying it was as far as one mile east of the Niagara River.[45]
^The new North Carolina–federal border was, from the north, southwest along various ridges of the Great Smoky Mountains; however, issues caused surveyors to eventually run a line roughly due south rather than continue along the ridge.[19]
^The new New York–Vermont border was, from the north: Lake Champlain, the Poultney River, then south following borders of townships.[32]
^The new Indiana Territory–Northwest Territory border was, from the south, a line from the mouth of the Kentucky River to Fort Recovery, then north.[97]
^The new Georgia–federal border was, from the south, up the Chattahoochee River to its great bend (near West Point), then a line from there towards and past Nickajack. The border's description said it would go until it reached the Tennessee River, and follow that up the river to Tennessee, but the river lay entirely within Tennessee.[12]
^There was some question as to whether the purchase also included the basins of the Missouri River and the Red River of the North, but the question was not relevant before the Treaty of 1818 definitively settled the border. Maps universally show the purchase including the Missouri River basin but excluding the Red River basin.[105]
^The new Illinois Territory–Indiana Territory border was, from the south, the Wabash River up to Post Vincennes, then north.[113]
^The northwestern remainder of Orleans Territory presumably rejoined Louisiana Territory, as its extent was still vaguely defined.
^Indiana was defined as the territory north of the Ohio River and east of the Wabash River, but while the territory's line turned north at Post Vincennes, the state's border continued up the Wabash until it reached the point where a line drawn north from Post Vincennes would last intersect the river as it weaved back and forth. The northern border of the state was a line east from 10 miles north of the southern tip of Lake Michigan, until it reached the meridian that formed Ohio's western border, which was a line drawn north from the mouth of the Great Miami River.[97]
^The new Arkansas Territory–federal border, from the north, a line from the southwestern corner of Missouri to a point on the Arkansas River "100 paces east" of Fort Smith, as the border of the lands of the Eastern Choctaw, then south.[137] However, the Arkansas Supreme Court determined in 1909 that the "100 paces east" was a clerical error, and that logically it should have said "100 paces west".[150]
^The new Michigan Territory–Wisconsin Territory border was, from Lake Superior: up the Montreal River to Lac Vieux Desert; a line to the source of the Menominee River; then down that to Green Bay. However, this definition was impossible: The Montreal River ended long before it reached Lac Vieux Desert. The issue would be resolved in 1850.[111]
^The new northeastern border was, from Passamaquoddy Bay: up the St. Croix River to its source; north to the St. John River; up that to the St. Francis River; up that to its source outlet at Lake Pohenegamook; southwest to the northwest branch of the St. John River; a line from there to where the St. John River crosses 46°25’ north; up the river to its source; along the highlands to the source of Halls Stream, then down that to 45° north.[140][15]
^The new international border was, from the Rio Grande: along the southern and western border of New Mexico until it meets the Gila River; down that to the Colorado River; then a line to a point one league south of the port of San Diego. However, the southern border of New Mexico was in question, with the US claim being 31°52′ north, and the Mexican claim being 32°22′ north.[188]
^The new California–federal border was, from the north: south along 120° west to 39° north; a line to where the Colorado River intersects 35° north; then down the Colorado River.[3]
^The borders of New Mexico Territory were, from where its border with Texas ended at 36°30′ north and 103° west: north to 38° north; west to the summit of the San Juan Mountains (called then the Sierra Madre); south along the ridge to 37° north; then west.[204]
^The new international border was, starting from where the Rio Grande crosses 31°47′ north: west 100 miles; south to 31°20′ north; west to 111° west; a line to a point on the Colorado River 20 miles below the mouth of the Gila River; then up the Colorado River.[213]
^The new Minnesota–federal border was, from the north: up the Red River to the Bois de Sioux River; up that to Lake Traverse and its southern tip; a line to Big Stone Lake and through that to its southern tip; then south.[170]
^The new Oregon–Washington Territory border was, from the north, up the Snake River to the mouth of the Owyhee River, then south.[191]
^The decree transferred land from the left bank of the Blackstone River to Rhode Island, including what is now East Providence, in exchange land around Fall River being transferred to Massachusetts.[14]
^The borders of the Department of Alaska were, from the Dixon Entrance: Up the Portland Channel to 56° north; then along the "summit of the mountains situated parallel to the coast" (the definition of which was disputed) to 141° west; then north.[275]
^The new Oklahoma Territory–federal border was, from where the Red River meets 98° west: north to the Canadian River; down that to Seminole land; north along that border to the North Canadian River; down that to Creek land; north and east along that border to 96° west; then north. This omits the Cherokee Outlet, whose complex borders separated the main portion of Oklahoma Territory from the former Public Land Strip.[308]
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