Higher densities because of more abundant food supplies through plant cultivation. Tropical forest farmers of South America and Caribbean Root crops dominant, esp. With this great staple, it was productive as few parts of the world. 20 persons working 6 hours a day for one month on conucos will provide bread for 300 persons for two years. Europe had no food plants of comparable yield until American potato was introduced.
Modern scholars estimates much less.
Native peoples wiped out by about 1530.