How did freedmen become a part of United States politics?

The Civil Rights Act of 1866, passed over the veto of President Andrew Johnson, gave ex-slaves full citizenship (except for voting) in the United States. ... The era of Reconstruction was an attempt to establish new governments in the former Confederacy and to bring freedmen into society as voting citizens.

The Freedmen's Bureau provided food, housing and medical aid, established schools and offered legal assistance. It also attempted to settle former slaves on land confiscated or abandoned during the war.

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it should be c, women were allowed to vote in all states because federal law supersedes state law.

"states can make their own laws, as long as they don't contradict what the federal law states. the states do not have the authority to pass a law that negates a federal law." -google