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.
Mexican War of Independence
From 1815 to 1821 most of the fighting for independence from Spain was done by small and isolated guerrilla bands. From these, two leaders arose: Guadalupe Victoria (born José Miguel Fernández y Félix) in Puebla and Vicente Guerrero in Oaxaca, both of whom gained allegiance and respect from their followers. Believing the situation under control, the Spanish viceroy issued a general pardon to every rebel who would lay down his arms. After ten years of civil war and the death of two of its founders, by early 1820 the independence movement was stalemated and close to collapse. The rebels faced stiff Spanish military resistance and the apathy of many of the most influential criollos.