Which tribe of indians actually gained strength as a result of their contacts with whites?

The correct answer to this open question is the following.

The tribe of Indians that actually gained strength as a result of their contacts with whites were the Iroquois.

One of the most important Native American Indian tribes in colonial America was the Iroquois. It was a form of a confederacy of many tribes in the Northeastern territories. They were the Seneca, Onondaga, the Mohawk, Oneida, and Cayuga. Their system of government was interesting because they already had a representative form of government where officials were elected. These tribes strengthened their presence with the arrival of colonists.