The president is empowered to negotiate treaties with foreign nations. treaties, however, do not become officially ratified until

 Treaties must be ratified by a two-thirds majority of the US Senate.

Details:

Article II, Section 2 of the Constitution lays out the process for treaties made by the United States with other nations.  That section of the Constitution says of the President, "He shall have Power, by and with the Advice and Consent of the Senate, to make Treaties, provided two thirds of the Senators present concur."

The advice and consent of the Senate typically comes after the treaty has been negotiated by the President.  As reported by Justia (a legal information site), "The Senate’s role in relation to treaties is essentially legislative in character."  In a Supreme Court decision in 1936, this was affirmed by the Court's decision, which said, that the President "alone negotiates. Into the field of negotiation, the Senate cannot intrude" (United States v. Curtiss-Wright Export Corp., 1936).   However, for the treaty to become active, the President must secure approval by the Senate, with a two-thirds majority vote, as stipulated by the Constitution.

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.