Final answer:
Sitting Bull was the leader of the Lakota Sioux, famous for his resistance to U.S. authority and his leadership at the Battle of Little Bighorn. After a period of exile, he returned to the U.S. and was killed by police in 1890.
Step-by-step explanation:
Sitting Bull was the leader of the Lakota Sioux tribe. As a spiritual leader and warrior, he played a crucial role in the resistance against the U.S. government's policies aimed at assimilating Native American tribes and taking their lands. During the Battle of Little Bighorn in 1876, Sitting Bull and his unified force of Lakota, Cheyenne, and Arapaho warriors achieved a significant victory over Colonel George Armstrong Custer's Seventh Cavalry.
After this battle, despite the Lakotas' success, many tribes returned to their lives or fled out of fear, while U.S. troops continued their campaign to assert control over the Native lands. Sitting Bull temporarily fled to Canada but later returned to work in Buffalo Bill's Wild West show.
Ultimately, his refusal to submit to U.S. authority resulted in his death at the hands of police who were trying to arrest him in December 1890, marking a tragic end to the iconic leader who defended Indigenous rights with unwavering tenacity.