Final answer:
Sentence 3 provides evidence of men hindering women's right to vote.
Step-by-step explanation:
The sentence that provides evidence that men were hindering women's right to vote is sentence 3. In this sentence, Frederick Douglass states that women's rights do not originate from the will or grace of men, and that men should remove their obstructive forces and usages that prevent women from expressing their sentiments at the polls and in government. This suggests that men are actively hindering women's right to vote by imposing fines, imprisonment, and other obstacles.
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