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 Afro-Mexicans in the Mexican War of Independence The history of Africans in Mexico has not been well documented or recognized by the government and society. The Spanish relied upon slavery to expand their empire and to increase their wealth, and during the 16th and 17th centuries, African slaves were brought to Mexico to toil in sugar fields and work in underground mines. Estimates vary, but somewhere between 200,000 and 500,000 slaves were brought to Mexico during the colonial expansion. Over the years this bloodline has been absorbed into the population and the contribution of Afro-Mexicans has largely been forgotten. During