Amajor reason for the formation of groups like the national congress of american indians was

The inadequacy of efforts to improve the lives of American Indians.

Explanation:

These groups are created to discuss policies to ensure the rights of indigenous peoples in America. Indigenous rights are often neglected and there is an inequity in guaranteeing these rights when the policies made to improve the lives of the natives are made by the "white man." For this reason, indigenous people have created groups such as the National Congress of Native Americans so that they can discuss and form policies that guarantee their rights and guarantees before society.

answer; (d) i believe that the correct answer is americans finally ran out of ammunition;