The poll tax, which was an effective tool used by white segregationists to keep African-Americans from voting in the South from the end of the Civil War until the early 1960s, was outlawed by .

Lyndon B. Johnson.

Explanation:

The poll tax was a fixed amount of tax that was to be paid per person before he/she could vote. This poll tax was used as a tool so that the African-Americans won't be able to participate in voting.

But in 1964 and 1965, President Lyndon B. Johnson outlawed this by singing the Civil Rights Act of 1965. President Lyndon Johnson succeeded the Presidentship after Kennedy in 1963.

According to the Civil Rights Act of 1965 or the Voting Rights Act of 1965, the barriers such as poll tax were removed at the local and state level. This act enabled African Americans to exercise their voting rights as per the Constitution.

So, the correct answer is Lyndon B. Johnson.

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