For anyone interested in what the Americas looked like before and after Columbus, I highly recommend the two books, 1491[1] and 1493[2], by Charles C. Mann. I finish the first one and I'm half way through the second one and really openend my eyes. Great reads!
[1] https://www.goodreads.com/book/show/39020.1491?ref=nav_sb_ss... [2] https://www.goodreads.com/book/show/9862761-1493