USA HISTORY

Detailed explanation-1: -Aztec people of Mexico dying of smallpox introduced by the Spaniards. Epidemics soon became a common consequence of contact. In April 1520, Spanish forces landed in what is now Veracruz, Mexico, unwittingly bringing along an African slave infected with smallpox.

Detailed explanation-2: -When Europeans began to explore and colonize other parts of the world, smallpox traveled with them. The native people of the Americas, including the Aztecs, were especially vulnerable to smallpox because they’d never been exposed to the virus and thus possessed no natural immunity.

Detailed explanation-3: -Earlier, the successful conquest of Mexican Aztec and Peruvian Inca empires by a handful of Spanish conquistadors led by Hernando Cortes and Francisco Pizarro, respectively, resulted in large part from epidemics of smallpox and measles virus infection that decimated the native defenders.

Detailed explanation-4: -Old World diseases that were not present in the Americas until contact include bubonic plague, measles, smallpox, mumps, chickenpox, influenza, cholera, diphtheria, typhus, malaria, leprosy, and yellow fever.

Detailed explanation-5: -Before 1492, Native Americans (Amerindians) hosted none of the acute infectious diseases that had long bedeviled most of Eurasia and Africa: measles, smallpox, influenza, mumps, typhus, and whooping cough, among others.