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 lowest number since 2003. A 2018 PLOSOne study estimated that the illegal immigrant population was in the range of 16 million to 29 million. The "residual method" is widely used to estimate the illegal immigrant population of the US. With this method, the known number of legally documented immigrants to the United States is subtracted from the reported U.S. Census number of self-proclaimed foreign-born people (based on immigration records and adjusted by projections of deaths and out-migration) to obtain the total, illegal immigrant (residual) population. This methodology is used by the US Department of Homeland Security, the Pew Hispanic Center,