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: -While epidemic disease was by far the leading cause of the population decline of the American indigenous peoples after 1492, there were other contributing factors, all of them related to European contact and colonization. One of these factors was warfare.

Detailed explanation-3: -As explorers and settlers arrived from Europe, a tidal wave of disease, especially in the years 1616-1619, reduced the native population by up to 90 percent. Pilgrim and Puritan colonists arrived on the New England coast to find empty villages waiting for them to occupy.

Detailed explanation-4: -American Indian populations plummeted after the arrival of Europeans in the New World, largely because of the spread of smallpox, typhus, measles, and other infectious diseases.