Poll taxes and literacy tests were established to limit the voting rights of

poor white Southerners.
people in border states.
African American men.
African American women.

African American men.

Explanation:

Poll taxes and literacy tests were established to limit the voting rights of African American men.

At the time, many people were against people with a different skin color. Therefore, they would discriminate against them.

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the answer is a) high entry costs