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I've always been bothered by the fact that Pleistocene megafauna died out in North and South America. I've never bought in to the whole over-hunting hypothesis as it never seemed there were enough humans to hunt out everything. I've also been bothered that certain animals didn't survive despite the ripe environments for them.
The American Lion, Cheetah, Horse, and Camel could have survived on the American prairies. The Bison certainly didn't go extinct so why did all of those other animals.
So here it is. I'm going to start a TL based on the hypothesis that not all megafauna died out at the end of the last Ice Age.
In addition to our current menagerie of North American animals, these beasts still roam the continent after the Ice Age:
Horses
American Lion
Camels
Cheetah
Jaguar
Stag-moose
Giant Beaver
Giant Peccaries
Columbian Mammoth (woolys live in the arctic)
Mastadon
Gian Sloths (Confined to a few enclaves)
What are the effects on the Native American cultures? Timeline will follow soon but I need input.