What happened at The battle of Little BigHorn?

Explanation:

The Battle of the Little Bighorn, also called Custer's Last Stand, marked the most decisive Native American victory and the worst U.S. Army defeat in the long Plains Indian War. The Battle of the Little Bighorn is significant because it proved to be the height of Native American power during the 19th century. It was also the worst U.S. Army defeat during the Plains Wars. The demise of Custer and his men outraged many white Americans and confirmed their image of the Indians as wild and bloodthirsty.

a system of cooperative federalism emerged, as the powers of the federal government expanded.