USA HISTORY

Detailed explanation-1: -When the conquistadors returned to Peru in 1532, a war of succession between the sons of Sapa Inca Huayna Capac, Huáscar and Atahualpa, and unrest among newly conquered territories weakened the empire. Perhaps more importantly, smallpox, influenza, typhus and measles had spread from Central America.

Detailed explanation-2: -The main view is that the Inca were eventually defeated due to inferior weapons, ‘open battle’ tactics, disease, internal unrest, the bold tactics of the Spanish, and the capture of the Inca’s Emperor.

Detailed explanation-3: -In addition to North America’s Native American populations, the Mayan and Incan civilizations were also nearly wiped out by smallpox. And other European diseases, such as measles and mumps, also took substantial tolls – altogether reducing some indigenous populations in the new world by 90 percent or more.

Detailed explanation-4: -Smallpox reached the Inca settlements in Peru long before Francisco Pizarro arrived there in 1526, making his conquest infinitely easier as the disease had killed the emperor, weakening the Inca state as his two sons fought for power.

Detailed explanation-5: -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.