What factors solidarity develop among american indians?

The factors that helped develop solidarity among the American Indians were the defense of indigenous territory and the need for survival.

Explanation:

The American Indians were robbed, plundered and tortured by the European man who coveted their lands for their riches and their freedom. We know that the American continent was built on the basis of the robbery and exploitation of native peoples, who suffered a lot from the colonization process and were often enslaved (as almost happened in Latin America).

All this exploitation created a concept of solidarity among the indigenous people, they knew that it would be very difficult to fight against the Europeans and for this reason decided to unite to defend their territory and to survive the violet invasion of the white man.

formulating the initial idea for the policy

answer is c.