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
Latin American wars of independence movement against their colonial master, finally ended as a full-fledged civil war. Traditionally, the process is divided into three stages: Patria Vieja, Reconquista, and Patria Nueva. The first uprising against Spanish rule took place in 1809, and criollos in Ecuador set up a junta on September 22, 1810 to rule in the name of the Bourbon monarch; but as elsewhere, it allowed assertion of their own power. Only in 1822 did Ecuador fully gain independence and became part of Gran Colombia, from which it withdrew in 1830. At the Battle of Pichincha, near present-day Quito, Ecuador on May 24, 1822,