He invents things like trains on the way and in the end the great spirit proclaims that he will return and he does. I wish I could remember more of the story details...One thing that I think I remember is that they end up more technologically advanced than we are now. Any help would be amazing He's/She's/Them's thanks in advance!
https://storiesonline.net/s/56322/a-close-call-book-1-a-new-beginning
by aubie56
Doug Holmes, an ex-Ranger and now an anthropologist, gets accidentally bounced back to Clovis-era New Mexico of 12,000 years ago. Join him as he copes with the primitive life style of the natives and becomes an important leader as he gradually introduces more modern devices to make their lives easier and more fun. His attitude is, this may change history, but to hell with that--I have to live here!
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