What we don’t often consider is where the idea of different races came from. God? Nature? Or was it man-made? — and if so, why? the story says.

“The Invention of Race,” a documentary produced and hosted by John Biewen, explores how these concepts developed from the ancient world to today.

According to MPR, in the 1940s, anthropologists tried to present racial differences as scientific fact by pulling out humans into three categories: Caucasoid, Mongoloid and Negroid.

“It is not a biological fact,” said historian Nell Irvin Painter.

Read the full story from MPR News