 Complete the following phrase:  Epidemic disease was the overwhelming cause of the population decline of the Indigenous peoples. After initial contact with Europeans and Africans, Old World diseases caused the deaths of 90 to 95 of the native population of the New World in the following 150 years. Smallpox killed from one third to half of the native population of Hispaniola in 1518. By killing the Incan ruler Huayna Capac, smallpox caused the 