Which is not a method southern state legislatures used to make it difficult for southern blacks to vote? - they attempted to overturn the 15th amendment. - they enacted poll taxes. - they threatened blacks with violence. - they imposed literacy and citizenship tests.

They attempted to overturn the 15th amendment is the correct answer.

Explanation:

The thirteen and fourteenth Amendments were passed in order to free the slaves after the civil war. Thirteenth amendment abolished the slavery and fourteenth amendment gave the slaves rights of US citizens.The fifteenth amendment was added later for protecting the rights of citizens irrespective of their caste. The southern states  tried to found a way around the amendment and tried not to let the black people vote. e.g Many states started to charge a poll tax, while the whites were exempted form it the Blacks were not, whites were excluded with the grandfather clause.

They attempted  to overturn the 15th Amendment.

Explanation:

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Please mark my answer as brainliest answer

in all honesty, it really hasn't. except that hitler killed himself.