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
Serb volunteers in the Greek War of Independence Serb volunteers in the Greek War of Independence Some Serbs joined the Greeks, their co-religionists, in the Greek War of Independence (1821–29). Volunteers arrived from Serbia, Montenegro, and territories still under Ottoman rule, to fight alongside the Greek rebels against the Ottoman Empire. Several of the volunteers were veterans of the Serbian Revolution, such as Hadži-Prodan, During the first decades of the 19th century, the First Serbian Uprising and the secret preparations for a Greek revolution coincided. The news of the Serbian revolt of 1804 were received with great joy by the Greeks, who viewed it as a paradigm for