In 1874, the U.S. Army sent an expedition, led by Lt. Col. George Armstrong Custer, into the Black Hills of what is now South Dakota. They returned to report that there was gold in them thar hills. Within two years, Americans were flocking by the thousands, lured there by the promise of striking it rich. There was just one problem: the land belonged to the Lakota Sioux tribe, and it was illegal – and dangerous – for the prospectors to even be there.  The Battle of the Little Bighorn...