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I would love to know what it was that wiped them out some 13,000 years ago. What happened to all the large North American Animals? What wiped them out? I find it difficult to believe that it was just humans that caused it because there were also humans in other parts of the world and they weren't able to wipe out pretty much all large land mammals.

Humans came late to North America. The large mammals likely had no natural fear of us.
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