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.
History of Mexico
By 1823, Mexicans of all classes were fed up with emperor Agustin de Iturbide's corrupt and oppressive rule. They overthrew him and 4 October 1824, the United Mexican States (Spanish: Estados Unidos Mexicanos) was established. The new constitution was partly modeled on the constitution of the United States. It guaranteed basic human rights and defined Mexico as a representative federal republic, in which responsibilities of government were divided between a central government and a number of smaller units called states. It also defined Catholicism as the official and unique religion. The Federal Republic of Central America was allowed to re-establish its independence, which it had declared on 1 July 1823.