C. Formerly enslaved people who were poor were usually unable to vote.
Poll tax laws were enacted in the South after the Civil War to restrict African American voting rights. These laws required voters to pay a tax in order to vote, which disproportionately affected African Americans who were often poor. As a result, many African Americans were effectively disenfranchised and unable to exercise their right to vote. This contributed to the maintenance of white supremacy and racial segregation in the South.