On August 13, 1521, the conquistadors and their native allies seized Tenochtitlan, the capital of the Aztec empire. The Spaniards succeeded because they had agreed with the Tlaxcalans and other indigenous self-governing communities (altepetl) to fight the Aztecs. After the conquest these communities continued their traditions, and the Spaniards replaced Aztec leadership with their own. The friars and the secular church converted the natives, and together with the crown they foiled the conquistadors’ attempts to become liege lords with jurisdiction. The process culminated in the New Laws of 1542, which curbed the encomienda, a grant to a Spaniard that comprised several Indian towns paying him or her tribute. In its stead a society of corporations evolved, composed of town councils, lay brotherhoods of churches, and others, complete with their own laws and jurisdictions. Then a series of silver strikes beginning at Zacatecas in 1546 drew settlers into the region called the Bajío north of the former Aztec and Tarascan empires. The local natives resisted initially, and when peace came, they and the settlers created a dynamic early capitalist economy that invigorated other regions. The frontier expanded when animal herds moved further north beyond the mines, and the zone of Spanish influence grew to the south as well.
In 1540 Spanish conquistadors and their indigenous allies began seizing the northwestern Yucatan Peninsula, and they took Tiho/Mérida in 1542. The Yucatan, the Bajío, and the other regions that composed colonial Mexico successively integrated into a global commercial network spanning Europe, Africa, and Asia. The crown and the merchant guild (consulado) in Seville sought to capture the burgeoning Atlantic commerce within the fleet shuttling between Seville/Cadiz and Veracruz and restrict the silver flowing from Acapulco to Asia via the Philippines. Market forces defied most of the rules they put in place. Merchants from Asia settled in Manila; Peruvians docked in Acapulco; and the Dutch, French, and English competed with fleet merchants or operated contraband trade from the Caribbean islands to New Spain. In the 18th century, the crown found allies to loosen trade regulations within the empire and curb corporative autonomies. A series of audits (visitas) shook New Spain, and more compliant viceroys and officials appeared, while the friars lost over one hundred parishes (doctrinas) during the mid-century. The king expelled the Jesuits in 1767; registered ships sailing individually replaced the fleet in 1778; and in 1786 José de Gálvez introduced the intendants in New Spain. As the empire transitioned toward a territorial state, Napoleon imprisoned the Spanish king (1808). In 1810 Miguel Hidalgo and a popular following unleashed the War of Independence. As the conflict unfolded, the legitimacy of the old order crumbled, and the empire dissolved in 1821.
U.S. foreign policy toward Latin America in the 19th century initially focused on excluding or limiting the military and economic influence of European powers, territorial expansion, and encouraging American commerce. These objectives were expressed in the No Transfer Principle (1811) and the Monroe Doctrine (1823). American policy was unilateralist (not isolationist); it gradually became more aggressive and interventionist as the idea of Manifest Destiny contributed to wars and military conflicts against indigenous peoples, France, Britain, Spain, and Mexico in the Western Hemisphere. Expansionist sentiments and U.S. domestic politics inspired annexationist impulses and filibuster expeditions to Mexico, Cuba, and parts of Central America. Civil war in the United States put a temporary halt to interventionism and imperial dreams in Latin America. From the 1870s until the end of the century, U.S. policy intensified efforts to establish political and military hegemony in the Western Hemisphere, including periodic naval interventions in the Caribbean and Central America, reaching even to Brazil in the 1890s. By the end of the century Secretary of State Richard Olney added the Olney Corollary to the Monroe Doctrine (“Today the United States is practically sovereign on this continent and its fiat is law upon the subjects to which it confines its interposition . . .”), and President Theodore Roosevelt contributed his own corollary in 1904 (“in the Western Hemisphere the adherence of the United States to the Monroe Doctrine may force the United States, however reluctantly, in flagrant cases of wrongdoing or impotence, to exercise an international police power”). American policy toward Latin America, at the turn of the century, explicitly justified unilateral intervention, military occupation, and transformation of sovereign states into political and economic protectorates in order to defend U.S. economic interests and an expanding concept of national security.