All of the above.
Many Southern states implemented various discriminatory practices to circumvent the voting rights guaranteed by the 15th Amendment, which was ratified in 1870 and aimed to protect the voting rights of African American men. Specifically:
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Poll Taxes: These required citizens to pay a fee in order to vote, which disproportionately affected poor individuals, including many African Americans and some poor whites.
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Grandfather Clauses: These allowed individuals to vote only if their grandfathers had been eligible to vote before Reconstruction, effectively excluding many African Americans whose grandfathers had been enslaved and thus unable to vote.
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Literacy Tests: These tests required voters to demonstrate reading and writing abilities by interpreting complex legal documents, which were often applied subjectively by white registrars and used to disenfranchise Black voters.
These measures collectively aimed to suppress the African American vote and maintain white supremacy in the political system.