Final answer:
The Twenty-Fourth Amendment, ratified in 1964, made it illegal to charge a poll tax to vote in federal elections. This prohibition was expanded to state elections in 1966 by the Supreme Court so the correct answer is option (
Step-by-step explanation:
The Amendment that Outlawed Poll Taxes
The amendment in the United States Constitution that made it illegal to charge a poll tax to vote is the Twenty-Fourth Amendment. This amendment was necessary despite the protections of the Fifteenth Amendment, which guaranteed the right to vote regardless of race, color, or previous condition of servitude, because states found ways to circumvent it. Poll taxes were one such method that disproportionately affected African Americans and other minorities, denying them their right to vote due to financial constraints.
The ratification of the Twenty-Fourth Amendment in 1964 specifically targeted this issue, prohibiting the use of poll taxes in federal elections. This prohibition was expanded to state elections in 1966 when the Supreme Court declared poll taxes unconstitutional at any level of government in the case of Harper v. Virginia Board of Elections.