Question

How did the Twenty-fourth Amendment affect the voting rights of African Americans?

Answer 1

It eliminated poll taxes in all national elections, allowing many African Americans a  chance to vote because they could now afford it.

On January 23, 1964, the United States ratified the 24th Amendment to the Constitution, prohibiting any poll tax in elections for federal officials.

Here's a link to help just in case:

http://www.americaslibrary.gov/jb/modern/jb_modern_polltax_1.html

Answer 2

It eliminated poll taxes in all nationals elections allowing many black Americans to vote