[261], Wyoming Territory was organized from portions of Dakota, Idaho, and Utah Territories.

The Webster–Ashburton Treaty specified that section of the border was to follow the surveyed line, rather than the exact parallel, thus moving the fort's area into the United States, and a new fort, Fort Montgomery, would be built on the spot in 1844. When Did the United States Become a Country.

Alaska, the last major acquisition in North America, was purchased from Russia in 1867. A small strip between the Texas Panhandle and Kansas Territory was unclaimed, due to falling south of Kansas Territory's border but north of 36°30′ north established in the Missouri Compromise as the northern limit of slavery, and thus Texas could not have it.

The country's expansion beyond North America began in 1856 with the passage of the Guano Islands Act, causing many small and uninhabited, but economically important, islands in the Pacific Ocean and Caribbean Sea to be claimed. [282], The North-Western Territory was transferred by the United Kingdom to Canada, thus transferring its portion of the Alaska boundary dispute. This effectively doubled the size of the colonies, now able to stretch west past the Proclamation Line to the Mississippi River. For more on this, read on. The Virginia counties that became West Virginia were: The new Idaho Territory–Montana Territory border was, from the north: south along, The new Dakota Territory–Idaho Territory border was, from the south: north along, The borders of the Department of Alaska were, from the, The borders of Wyoming Territory were parallels, The new Oklahoma Territory–federal border was, from where the, Text from Webster–Ashburton Treaty: "till the line thus run intersects the old line of boundary surveyed and marked by Valentine and Collins previously to the year 1774, as the 45th degree of north latitude, and which has been known and understood to be the line of actual division between the States of New York and Vermont on one side, and the British Province of Canada on the other", Martis, Kenneth C., "Historical Atlas of Political Parties in the United States Congress: 1789-1989, 1989, W.Va. Acts 1863, 1st sess., ch.
Virgin Islands and the British Virgin Islands, Secretary's Orders 3205: Administration of Navassa Island, Treaty on maritime boundaries between the United Mexican States and the United States of America, "New Jersey v. New York – 523 U.S. 767 (1998)", Treaty between the Government of the United Mexican States and the Government of the United States of America on the delimitation of the continental shelf in the western Gulf of Mexico beyond 200 nautical miles, "Minute 315: Adoption of the Delineation of the International Boundary on the 2008 Aerial Photographic Mosaic of the Rio Grande", "Treaty between the Government of Niue and the Government of the United States of America on the delimitation of a maritime boundary", "Border of North Carolina and South Carolina Realigned on January 1st", "Convention Between the United States and Mexico for the Elimination of the Bancos in the Rio Grande from the Effects of Article II of the Treaty of November 12, 1884", Burgundian and Habsburg in the Low Countries, Drafting and ratification of Constitution, Office of the Director of National Intelligence, Territorial evolution of the United States, https://en.wikipedia.org/w/index.php?title=Territorial_evolution_of_the_United_States&oldid=977908529, Former regions and territories of the United States, Articles with dead external links from June 2018, Creative Commons Attribution-ShareAlike License, The Counties of New Castle, Kent, and Sussex, upon Delaware enacted a, Representatives of the United States and the, Commissioners agreed on the source of the, Since its name was now shared with the state of, This is the earliest known date of the name ", The overlap of the longitudinal southern border between, Surveying conducted along the border with, The federal government purchased the western claims of, The United States purchased a large parcel from. The Best History Museums to Virtually Tour During the COVID-19 Pandemic, Virtual Reality Experiences That Let You See History Up Close, The Most Accurate Movies Based on History Worth Seeing, Great History Audiobooks to Listen to Anywhere.

The British colonies became independent states.

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