Why did AIM leaders traditional Oglala leaders and the dissident Oglalas take on the U.S. government?

AIM leaders, traditional Oglala leaders, and dissident Oglalas confronted the U.S. government primarily due to longstanding grievances over treaty violations, broken promises, and systemic injustices faced by Native Americans. They sought to reclaim sovereignty, protect their land, and address issues like poverty, unemployment, and inadequate healthcare within their communities. The conflict was exacerbated by the government's failure to address these concerns, leading to increased activism and resistance. Their actions were part of a broader movement for civil rights and self-determination for Indigenous peoples in the United States.