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 the Mexican War of Independence 1810- 1821, it is estimated that about 30 to 40 percent of mixed race Mexicans had African in their mix. The decree abolishing slavery by priest Miguel Hidalgo, Mexico’s Founding Father, was a significant enticement to attract Afro-Mexicans to the fighting ranks, and there were many unsung heroes. Most of the Mexican citizens with African ascendance are located in the southern part of the territory, their location is mostly based on that the importance of the ports and harbors that connected the Pacific Ocean and the Gulf of Mexico which goes to the Atlantic. The