Comment by petesergeant
9 hours ago
I'd be interested in an alternative world history where the first humans into North America had domesticated and saved the local horses that were kicking around, or the Vikings had left a bunch on their earlier expeditions. Alternatively where the Vikings had managed to give the locals small pox and other European diseases en-masse before leaving.
Not exactly your scenario, but The Years of Rice and Salt, by Kim Stanley Robinson, has Europe almost wiped out by the Black Death.
https://www.goodreads.com/book/show/2723.The_Years_of_Rice_a...