It is a map of human populations going back at least 5000 years. I was focused on the Americas, and haven't gotten into all the details even there. I was specifically looking at the mound empire of the midwest states. The amount of info is staggering.
I don't know. I was looking for a similar map that I had forgotten the location of, and came across this one, which is far more detailed. I'm about 4 hours into it.