Why there were tens of millions of bison

Ten months ago posted, but newly found.

“I would expect hunter-gatherers entering uninhabited America to have done pretty well, and have high population growth rates, especially after they become more familiar with the local ecology. There is good reason to think that early Amerindians did: Bayesian skyline analysis of their mtDNA indicates fast population growth. They were expert hunters before they ever arrived, and once they got rolling, they seem to have wiped out the megafauna quite rapidly.”

https://westhunt.wordpress.com/2021/11/12/threading-the-needle/

When the early trans-Siberians arrived, the North Americas contained few bison. The newcomers, experienced in killing big herbivores and carnivores, extinguished competitors and predators, leaving millions of acres of nutritious plains grass for the bison. By eliminating native species, the now-Native Americans provided the basis for their own expansion. They were, in modern terminology, colonists.