The American presidential system is different from
most parliamentary systems because

This system is distinguished from others because it has a chief executive (the president) who is chosen by the people to serve a limited term in office with a distinct separation of powers (the executive branch) as well as specific limitations on exactly what he/she can do while in office.

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.

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