USA HISTORY

Detailed explanation-1: -When the Europeans arrived, carrying germs which thrived in dense, semi-urban populations, the indigenous people of the Americas were effectively doomed. They had never experienced smallpox, measles or flu before, and the viruses tore through the continent, killing an estimated 90% of Native Americans.

Detailed explanation-2: -In addition to deliberate killings and wars, Native Americans died in massive numbers from infections endemic among Europeans. Much of this was associated with respiratory tract infections, including smallpox, tuberculosis, measles, and influenza (1, 2).

Detailed explanation-3: -Following Christopher Columbus’ arrival in North America in 1492, violence and disease killed 90% of the indigenous population-nearly 55 million people-according to a study published this year.

Detailed explanation-4: -When it came to disease, the exchange was rather lopsided-but at least one deadly disease appears to have made the trip from the Americas to Europe. The first known outbreak of venereal syphilis occurred in 1495, among the troops led by France’s King Charles VIII in an invasion of Naples; it soon spread across Europe.

Detailed explanation-5: -Native peoples of America had no immunity to the diseases that European explorers and colonists brought with them. Diseases such as smallpox, influenza, measles, and even chicken pox proved deadly to American Indians. Europeans were used to these diseases, but Indian people had no resistance to them.