but dropped to 6 million by 1600, based on a drop in atmospheric during that period. Other studies have disputed this conclusion. The Indigenous population of the Americas in 1492 was not necessarily at a high point and may actually have already been in decline in some areas. Indigenous populations in most areas of the Americas reached a low point by the early 20th century. Using an estimate of approximately 37 million people in Mexico, Central and South America in 1492 (including 6 million in the Aztec Empire, 5–10 million in the Mayan States, 11 million in what is now Brazil, and 12 million in the Inca Empire), the lowest estimates give a death toll from all causes of 80% by the end of the 17th century (nine million people in 1650). Latin America would match its 15th-century population early in the 19th century; it numbered 17 million in 1800, 30 million in 1850, 61 million in 1900, 105 million in 1930, 218 million in 1960, 361 million in 1980, and 563 million in 2005. In the last three decades of the 16th century, the population of present-day Mexico dropped to about one million people. The Maya population is today estimated at six million, which is about the same as at the end of the 15th century, according to some estimates. In what is now Brazil, the Indigenous population declined from a pre-Columbian high of an estimated four million to some 300,000. Over 60 million Brazilians possess at least one Native South American ancestor, according to a DNA study. While it is difficult to determine exactly how many Natives lived in North America before Columbus, estimates range from 3.8 million, as mentioned above, to 7 million people to a high of 18 million. Scholars vary on the estimated size of the Indigenous population in what is now Canada prior to colonization and on the effects of European contact. During the late 15th century is estimated to have been between 200,000 and two million, with a figure of 500,000 currently accepted by Canada's Royal Commission on Aboriginal Health. Although not without conflict, European Canadians' early interactions with First Nations and Inuit populations were relatively peaceful. However repeated outbreaks of European infectious diseases such as influenza, measles and smallpox (to which they had no natural immunity), combined with other effects of European contact, resulted in a twenty-five percent to eighty percent Indigenous