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
No independence before majority rule No independence before majority rule No independence before majority rule (abbreviated NIBMAR) was a policy adopted by the United Kingdom requiring the implementation of majority rule in a colony, rather than rule by the white colonial minority, before the empire granted its colony independence. It was sometimes reinterpreted as no independence before majority African rule. In particular, this position was advocated with respect to the future status of Rhodesia as an independent state. British prime minister Harold Wilson was pressured into adopting the approach during a conference in London. Wilson was not initially inclined to do so, fearing it would