Population history of indigenous peoples of the Americas 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. While it is difficult to determine exactly how many Natives lived in North America before Columbus, estimates range from a low of 2.1 million to 7 million people to a high of 18 million. The aboriginal population of Canada during the late 15th century is estimated to have been
Illegal immigrant population of the United States Illegal immigrant population of the United States The actual size and the origin of the illegal immigrant population in the United States is uncertain and is difficult to ascertain because of difficulty in accurately counting individuals in this population. Figures from national surveys, administrative data and other sources of information vary widely. The number of illegal immigrants peaked at about 12 million in 2007 and since that time has declined. According to the nonpartisan Pew Research Center, the estimated population of illegal immigrants in the U.S. rose rapidly in the 1990s, "from an estimated 3.5 million in 1990 to a