How did the Northwest Ordinance influence the expansion of the United States?
A. It outlawed slavery in all future territories the United States might
claim.
B. It immediately added five new states to the country.
C. It made it clear that people living in U. S. territories had the same
rights as people living in established states.
D. It allowed American Indians to become full citizens of the United
States.

C. It made it clear that people living in U.S. territories had the same  rights as people living in established states.

Explanation:

The "Northwest Ordinance" was enacted by the Congress and adopted in 1787. It was meant to provide policies for the new states that they were about to admit. It influenced the expansion of the United States by making clear that people who are living in the established states had the same rights as those living in the U.S. territories; this meant that they were not inferior. These rights included the right to due process, religious freedom and so on. It outlawed slavery in the new states, but it didn't mention about forbidding slavery in the future territories.

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the answer is 1.. i think