Indian Removal Act: This act passed in 1830 authorized the forced relocation of Native Americans from their ancestral lands in southeastern states to lands west of the Mississippi River.
Battle of Little Bighorn: A significant battle in 1876 where Lakota Sioux and Cheyenne warriors successfully defeated U.S. Army forces led by General George Custer.
Wounded Knee Massacre: In 1890, U.S. troops opened fire on a group of unarmed Lakota Sioux at Wounded Knee Creek, leading to the death of around 150 Native Americans and marking an end to organized armed resistance against U.S. expansion.