Which amendment forbade requiring the payment of a poll tax to vote in a federal election?

The 24th Amendment to the United States Constitution, ratified in 1964, forbids the requirement of a poll tax in federal elections. This amendment was a significant step in the Civil Rights Movement, aimed at eliminating financial barriers that disproportionately affected low-income and minority voters. The Supreme Court later ruled that poll taxes were also unconstitutional in state elections, further expanding voting rights.