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.
Republic of Texas
Along with the rest of Mexico, Texas gained its independence from Spain in 1821 following the Treaty of Córdoba, and the new Mexican state was organized under the Plan of Iguala, which created Mexico as a constitutional monarchy under its first Emperor Agustín de Iturbide. During the transition from a Spanish territory to part of the independent country of Mexico, Stephen F. Austin led a group of American settlers known as the Old Three Hundred, who negotiated the right to settle in Texas with the Spanish Royal governor of the territory. Since Mexican independence had been ratified by Spain shortly thereafter, Austin would later travel to Mexico City to secure the support of the new country for his right to settle. The establishment of Mexican Texas coincided with the Austin-led settlement, leading to animosity between Mexican authorities and ongoing American settlement of Texas. The First Mexican Empire was short lived, being replaced by a republican form of government in 1823. Following Austin's lead, additional groups of settlers, known as Empresarios, continued to colonize Mexican Texas from the United States. In 1830, Mexican President Anastasio Bustamante outlawed American immigration to Texas, following several conflicts with the Empresarios over the status of slavery in the region. Angered at the interference of the Mexican government, the Empresarios held the Convention of 1832, which is considered the first formal step in what would later become the Texas Revolution.