The creation of the first and second triumvirates in rome during the 1st century b. c is evidence that

During the First triumvirate the political order was in chaos and the Republic was in a serious difficulty moment. Basically what happened during the First and second Triumvirates in Rome was that the leaders of Military forces appropriated illegally of the power started to dominate the Roman.

the answer is b: the religion they practice.

here's why:

there were many different native american tribes and those with similar characteristics formed a main tribe or nation. each had its own language, religion and customs.