The Fifteenth Amendment to the United States Constitution prohibits the federal and state governments from denying a citizen the
right to vote based on that citizen's "
race,
color, or previous condition of servitude." It was ratified on February 3, 1870, as the third and last of the Reconstruction Amendments. But by 1869, voting rights were restricted in all states to white men. The narrow election of
Ulysses S. Grant to the presidency in
1868 convinced a majority of
Republicans that protecting the franchise of black men was important for the party's future. After rejecting broader versions of a suffrage amendment, Congress proposed a compromise amendment banning franchise restrictions on the basis of race, color, or previous servitude on February 26, 1869. The amendment survived a difficult ratification fight and was adopted on March 30, 1870. After blacks gained the vote, the
Ku Klux Klan directed some of their attacks to disrupt their political meetings and intimidate them at the polls, to
suppress black participation. In the mid-1870s, there was a rise in new insurgent groups, such as the
Red Shirts and
White League, who acted on behalf of white supremacists calling themselves "
Redeemers", to violently suppress black voting. While Redeemers in the Democrats regained local power in southern state legislatures, through the 1880s and early 1890s, numerous blacks continued to be elected to local offices in many states, as well as to Congress as late as 1894. Beginning around 1900, states in the former Confederacy passed new constitutions and other laws that incorporated methods to
disenfranchise blacks, such as
poll taxes, residency rules, and
literacy tests administered by white staff, sometimes with exemptions for whites via
grandfather clauses. were forced off the voter registration rolls and out of the political system, effectively excluding millions of people from representation. In the twentieth century, the Court interpreted the amendment more broadly, striking down grandfather clauses in
Guinn v. United States (1915). It took a quarter-century to finally dismantle the white primary system in the "
Texas primary cases" (1927–1953). With the South having become a one-party region after the disenfranchisement of blacks,
Democratic Party primaries were the only competitive contests in those states. But Southern states reacted rapidly to Supreme Court decisions, often devising new ways to continue to exclude blacks from voter rolls and voting; most blacks in the South did not gain the ability to vote until after the passage of the mid-1960s federal civil rights legislation and the beginning of federal oversight of voter registration and district boundaries. The
Twenty-fourth Amendment (1964) forbade the requirement for poll taxes in federal elections; by this time five of the eleven southern states continued to require such taxes. Together with the U.S. Supreme Court ruling in
Harper v. Virginia State Board of Elections (1966), which forbade requiring poll taxes in state elections, blacks regained the opportunity to participate in the U.S. political system. == Erosion, litigation, and scope ==