I'm very sure that the answer to your question is D: To leave a lasting mark.
Sorry if this is wrong, have a good day!
Your answer will be c, hope this helps :)
Answer:
Because the northwest territory must be safe at all for enemy if there's no military the enemy can go around so they can pass through inside.
Explanation:
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In 1870 the 15th amendment was ratified and gave the right to vote to all males including african ammericans