It's Native American Heritage Day. NPR's Steve Inskeep talks to Ned Blackhawk, a professor of History and American Studies at Yale, about the history of the day and what it means to observe it.

Cramer. It wasn't long before all of the most cliched Native American caricatures and stereotypes came out, she says: the hand-over-mouth war whoop, the "tomahawk chop" and "twirling around in a ...