Final answer:
Southerners used poll taxes, literacy tests, and white-only primaries to restrict African American voting rights, circumventing the Fifteenth Amendment without openly violating its race-neutral mandate.
Step-by-step explanation:
After the ratification of the Fifteenth Amendment, various methods were employed by white Southerners to restrict African American voting rights without directly violating the amendment. One significant tactic included the implementation of poll taxes, which imposed a fee that many African Americans could not afford, effectively preventing them from voting. Additionally, states instituted literacy tests, which were often unfairly administered to African Americans and designed to be difficult to pass. These tests were not applied uniformly, allowing many white voters to circumvent these barriers through grandfather clauses, which granted voting rights based on one's ancestors' eligibility to vote before the implementation of such tests. Furthermore, the establishment of white-only primaries by the Democratic Party ensured African American exclusion from a crucial stage of the electoral process, further diminishing their political influence.
Despite these disenfranchisement tactics, the resilience and courage of African Americans led some to register to vote, though often their votes were undermined by the manipulative political structures of the era. This systematic repression of African American voting rights partly defined the Jim Crow era, lasting approximately from 1877 to 1965.