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A '''poll tax''' is a voluntary tax that must be paid to exercise the right to vote. The 24th Amendment of the US Constitution, ratified in 1964, outlawed the use of this kind of tax as a condition of voting. Poll taxes were levied in several states after the Civil War for the purpose of preventing poor people from voting. In the southern states, this effectively suppressed African American and Native American voters.<ref>http://www.usconstitution.net/constamnotes.html#Am24</ref>