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
After a protracted struggle (1810–21) for independence, New Spain became the sovereign nation of Mexico, with the signing of the Treaty of Córdoba. A brief period of monarchy (1821–23), called the First Mexican Empire, was followed by the founding of the Republic of Mexico, established under a federal constitution in 1824. Legal racial categories were eliminated, abolishing the system of castas. Slavery was not abolished at independence in 1821 or with the constitution in 1824, but was eliminated in 1829. Mexico continues to be constituted as a federated republic, under the Mexican Constitution of 1917.