The Northwest Ordinance influenced the expansion of the United States as it outlawed slavery in all future territories the United States might claim. Hence, Option A is correct.
What is the Northwest Ordinance?
An ordinance which was adopted on July 13, 1987 by the Confederation Congress. A government named the Northwest Territory was established after this ordinance.
As a result, the Northwest Ordinance influenced the expansion of the US and outlawed slavery in all future territories the United States claimed. Option A is right.
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