"not "Indian Tribes"."
The term "tribe" should never be used with a positive connotation. With that said, it can be an accurate term for those specific Amerindian societies which did practice tribalism. The problem is that, due to Eurocentrism, the term "tribe" in mainstream journalism:
1) is not used to describe "white" societies which practiced tribalism (e.g. Manifest Destiny);
2) is used to describe Amerindian societies even if they didn't practice tribalism!