Lincoln’s treatment of the Dakota Indians:

Growing up in Mankato, Minnesota, John Biewen says, nobody ever talked about the most important historical event ever to happen there: in 1862, it was the site of the largest mass execution in U.S. history. Thirty-eight Dakota Indians were hanged after a war with white settlers. John went back to Minnesota to figure out what really happened 150 years ago, and why Minnesotans didn’t talk about it much after.

via Little War on the Prairie | This American Life.