There is no singular they. I’ve read a few books on the topic. You’re ultimately drawing from at best a snapshot of when the Spanish arrived or otherwise when

There is no singular they. I’ve read a few books on the topic. You’re ultimately drawing from at best a snapshot of when the Spanish arrived or otherwise when English settlers or their American descendants were encountering populations wrecked by successive waves of disease. So it’s hard to know what things looked like prior and whether there was a stable equilibrium. We certainly know the Yucatán had at one point been basically stripped of trees for slash and burn agriculture. The forest agronomy that may have been practiced in the eastern woodlands probably relied heavily on both burning vast swaths of the land periodically and low population density. I’m not sure what that really does for us. Supporting really small numbers of people with vast swaths of highly fertile land has never really been a big problem.