Question

poll taxes and literacy tests were established to limit the voting rights of
white southerners.
people in border states.
african american men.
african american women.

Explanation:

Poll taxes and literacy tests were Jim - Crow era measures in the US South. After the 15th Amendment gave African American men the right to vote, these were used as discriminatory practices to disenfranchise them.

Answer:

C. African American men.