According to scholars, how many Natives were already in the Americas when Europeans arrived, and how many of them were in North America?

“Most scholars writing at the end of the 19th century estimated that the pre-Columbian population was as low as 10 million; by the end of the 20th century most scholars gravitated to a middle estimate of around 50 million, with some historians arguing for an estimate of 100 million or more.” Combining all published estimates throughout the americas there were probably around 60 million in 1492.