Mexican War of Independence
Iturbide's assignment to the Oaxaca expedition coincided with a successful military coup in Spain against the monarchy of Ferdinand VII. The coup leaders, part of an expeditionary force assembled to suppress the independence movements in the Americas, had turned against the monarchy. They compelled the reluctant Ferdinand to reinstate the liberal Spanish Constitution of 1812 that created a constitutional monarchy. When news of the liberal charter reached Mexico, Iturbide perceived it both as a threat to the status quo and a catalyst to rouse the criollos to gain control of Mexico. Independence was achieved when conservative Royalist forces in the colonies chose to rise up against the liberal regime in Spain; it was an about-face compared to their previous opposition to the peasant insurgency. After an initial clash with Guerrero's forces, Iturbide assumed command of the royal army. At Iguala, he allied his formerly royalist force with Guerrero’s radical insurgents to discuss the renewed struggle for independence.
New Mexico
New Mexico received its name long before the present-day nation of Mexico won independence from Spain and adopted that name in 1821. Spanish explorers recorded this region as New Mexico ("" in Spanish) in 1563. In 1581, the Chamuscado and Rodríguez Expedition named the region north of the Rio Grande "San Felipe del Nuevo México". The Spaniards hoped to find wealthy Mexican Indian cultures there similar to those of the Aztec (Mexica) Empire of the Valley of Mexico. The indigenous cultures of New Mexico, however, proved to be unrelated to the Aztecs, and were not wealthy. Before statehood, the name "New Mexico" was applied to various configurations of the U.S. territory, to a Mexican state, and to a province of New Spain, all in the same general area, but of varying extensions.