To add upon the influx of land that the United states was acquiring at this time was the Convention of 1818 which the United States and Britain used to fixate the undefined …show more content…
James Polk openly discussed a plea to purchase the lands, but Mexico rejected the offer, which resulted in the deployment of U.S troops in the region. Mexican soldiers later attacked the garrison which resulted in the death of a dozen American troops. Those same Mexican soldiers then laid siege to an American fort by the Rio Granda river. which led to the further mobilization of the U.S military into the war. The conflict lasted for a year, and led to the loss of half of Mexico 's Northern land claims to the United States. Additionally to the Western front of California was the cession of Mexico 's Northern territories which took place shortly after the Mexican-American war. Originally, Mexico did not accept this loss, however the persuasive approach of U.S troops into the capital of Mexico, quickly shifted opinions upon the