Question

following the passage of the fifteenth amendment, states attempted to limit voting rights of african americans through
registration quotas
state constitutions
poll taxes and literacy tests
blood tests and genealogy

Explanation:

After the Fifteenth Amendment which granted African - American men the right to vote, states tried to limit these rights through poll taxes (a fee to vote) and literacy tests (tests to determine if one could read and write). These were discriminatory measures to disenfranchise African - Americans.

Answer:

C. poll taxes and literacy tests