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Prior to this claim, numerous officials of both countries had agreed to the Nueces boundary. In addition, American settlers had been moving there for some time.

While both sides took some belligerent postures, neither country wanted to go to war over this territory.




On April 30, 1803, The United States purchased the Louisiana Territory from Spain for $15 million. This ended a colorful series of claims, counter-claims and military skirmishes over this territory. To the north, much of the border was with France. This treaty annexed land to the United States that would become parts of Texas, New Mexico, Kansas, Oklahoma, and part of Colorado. This area included land that became Idaho, part of Montana, Oregon, Washington, and part of Wyoming except for Hawaii, the acquisition of land for the United States was completed with the purchase of Alaska from Russia for $7.


On June 15, 1846, a treaty signed with Great Britain gave the United States the Oregon Territories.


The Mexican War began on May 8, partly caused by Texas’ unilateral claim that its boundary with Mexico was at the Rio Grande River instead of the Nueces River. The United States won this war, and the Treat of Guadalupe Hidalgo gave the United States the disputed land, which included California, Nevada, and Utah, along with parts of Arizona, Colorado, New Mexico and Wyoming, as well as the land contained in Texas’ expanded claims (south to the Rio Grande River).


April 1, 1844: The United States signed the Adams-Onis Treaty with Spain. Some of this anti-Mexico view was racist. This land included what is now Arkansas, part of Colorado, Iowa, Louisiana, and part of Minnesota, Missouri, and part of Montana, part of North Dakota, part of Oklahoma, South Dakota, and part of Wyoming.