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The American Buffalo numbered in the tens of millions before westward expansion took hold on the plains. But a combination of greed and federal policies designed to undermine Native Americans, whose existence depended upon the creature, nearly wiped out the buffalo. 鈥淎merican Buffalo,鈥� a new film by Ken Burns, explores these issues. It begins airing Monday night.

The Dust Bowl was a critical moment in American history鈥�a human caused ecological disaster that destroyed the farmland of the great plains and turned鈥�