Final answer:
The passing of the Indian Self-Determination and Education Assistance Act was most directly led by a shift in the American attitude towards Native Americans, as well as the efforts of Native American leaders who appealed to Congress for change.
Step-by-step explanation:
The passing of the Indian Self-Determination and Education Assistance Act was most directly led by a shift in the American attitude towards Native Americans. The act was a response to the continued fight for rights and identity by Native Americans, as well as the efforts of Native American leaders who appealed to Congress for change. The act itself guaranteed tribal governments the authority to govern their own reservations, administer federal aid, and determine how natural resources on tribal lands would be utilized.