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In page Nineteenth Amendment to the United States Constitution:

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African-Americans continued to face barriers preventing them from exercising their vote until a new movement arose in the 1950s and 1960s, which posited voting rights as civil rights.[2][7] Nearly a thousand civil rights workers converged on the South to support voting rights as part of Freedom Summer. However, state officials continued to refuse registration until the passage of the Voting Rights Act of 1965, which prohibited racial discrimination in voting.[5][8] For the first time, states were forbidden from imposing discriminatory restrictions on voting eligibility, and mechanisms were placed allowing the federal government to enforce its provisions.[7]