Mexican Cession Mexican Cession, with considerable local autonomy punctuated by several revolts and few troops sent from central Mexico, in the period from 1821–22 after independence from Spain up through 1846 when U.S. military forces seized control of California and New Mexico on the outbreak of the Mexican–American War. The northern boundary of the 42nd parallel north was set by the Adams–Onís Treaty signed by the United States and Spain in 1821 and ratified by Mexico in 1831. The eastern boundary of the Mexican Cession was the Texas claim at the Rio Grande and extending north from the headwaters of the Jojo
Afro-Mexicans in the Mexican War of Independence majority of them still is linked to agricultural economic activities. The war of independence was precipitated by events in Europe, specifically a failed coup against the viceroy Joseph Bonaparte. This encouraged small groups of rebels to take up arms against colonial rule. In September 1810, peasants and indigenous inhabitants of Dolores (Guanajuato) were called to action by the secular Catholic priest Miguel Hidalgo y Costilla, former rector of the Colegio de San Nicolás Obispo. People of color were able to see that their independence was worth putting up a fight for it. However, Hidalgo was defeated. José Maria Morelos y