Affiliate links for the products on this page are from partners that compensate us and terms apply to offers listed (see our advertiser disclosure with our list of partners for more details). However, ...

Zoom out on the graph of human population until it encompasses the entire timeline of our species and you’ll notice something alarming. It looks like a right angle, with one line hovering near zero ...

Graphs, maps, and tables -- Introduction -- 1. Paleo-Indians, Europeans, and the settlement of America -- 2. Colonization and settlement of North America -- 3. The early Republic to 1860 -- 4. The ...

Elon Musk posted two tweets yesterday outlining his concerns about declining birth rates in the U.S., sparking discussion about what he called "the biggest threat to civilization"—population collapse.