History of Hispanic and Latino Americans in the United States
In 1821, Mexico gained independence from Spain, annexing the southwest of the present United States, including Arizona. As missions began to wither, Mexico began auctioning off more land, causing the Pimería Alta and the Apachería to shrink as territory expanded. In the meantime, American mountain men began to enter the region, looking to trap beavers for their pelts. In 1836, Texas declared independence from Mexico and claimed much of the territory in the northern lands of Mexico. When the United States annexed Texas in 1846 over the strong objections of the Mexican government, U.S. troops moved into disputed territory. The hostilities erupted in the Mexican–American War (1846–1848). The U.S. occupied Mexico City and forced the newly founded Mexican Republic to give up its northern half, including the later Arizona.
Mexico–United Kingdom relations
After Mexico declared its independence in 1810, Britain was the first European "great power" to recognize Mexican sovereignty. Soon afterwards, Emperor Agustín de Iturbide sent a diplomatic envoy to London to establish diplomatic communications between the two nations. In 1837, both nations signed a treaty to abolish the slave trade. The British established a network of merchant houses in the major cities. However, according to Hilarie J. Heath, the results were bleak: