who has the authority to set voting requirements
Voting Rights Act of 1965 As initially ratified, the United States Constitution granted each state complete discretion to determine voter qualifications for its residents.[13][14]:50 After the Civil War, the three Reconstruction Amendments were ratified and limited this discretion. The Thirteenth Amendment (1865) prohibits slavery; the Fourteenth Amendment (1868) grants citizenship to anyone "born or naturalized in the United States" and guarantees every person due process and equal protection rights; and the Fifteenth Amendment (1870) provides that "[t]he right of citizens of the United States to vote shall not be denied or abridged by the United States or by any State on account of race, color, or previous condition of servitude." These Amendments also empower Congress to enforce their provisions through "appropriate legislation".[15]