What does it mean to colonize an area?

Colonization, or colonisation refers to large-scale population movements where the migrants maintain strong links with their or their ancestors' former country, gaining significant privileges over other inhabitants of the territory by such links

To colonize is to settle in, and take control of, land outside your own borders. Usually, a large, powerful country colonizes a territory or area that's much less powerful.

c, they united with once

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.