age from 21 to 18, effective 1971). The Voting Rights Act of 1965 provided federal oversight of elections in discriminatory jurisdictions, banned literacy tests and similar discriminatory devices, and created legal remedies for people affected by voting discrimination. The Court also found poll taxes in state election unconstitutional under the Fourteenth Amendment in Harper v. Virginia State Board of Elections (1966). Text Background In the final years of the American Civil War and the Reconstruction Era that followed, Congress repeatedly debated the rights of black former slaves freed by the 1863 Emancipation Proclamation and the 1865 Thirteenth Amendment, the latter of which had formally abolished slavery. Following the passage of the Thirteenth Amendment by Congress, however, Republicans grew concerned over the increase it would create in the congressional representation of the Democratic-dominated Southern states. Because the full population of freed slaves would be now counted rather than the three-fifths mandated by the previous Three-Fifths Compromise, the Southern states would dramatically increase their power in the population-based House of Representatives. Republicans hoped to offset this advantage by attracting and protecting votes of the newly enfranchised black population. In 1865, Congress passed what would become the Civil Rights Act of 1866, guaranteeing citizenship without regard to race, color, or previous condition of slavery or involuntary servitude. The bill also guaranteed equal benefits and access to the law, a direct assault on the Black Codes passed by many post-war Southern states. The Black Codes attempted to return ex-slaves to something like their former condition by, among other things, restricting their movement, forcing them to enter into year-long labor contracts, prohibiting them from owning firearms, and by preventing them from suing or testifying in court. Although strongly urged by moderates in Congress to sign the bill, President Johnson vetoed it on March 27, 1866. In his veto message, he objected to the measure because it conferred citizenship on the freedmen at a time when 11 out of 36 states were unrepresented in the Congress, and that it discriminated in favor of African Americans and against whites. Three weeks later, Johnson's veto was overridden and the measure became law. Despite this victory, even some Republicans who had supported the goals of the Civil Rights Act began to doubt that Congress possessed the constitutional power to turn those goals into laws. The experience encouraged both radical and moderate Republicans to seek Constitutional guarantees for black rights,