Here are the specific amendments and legislative acts related to your queries:
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Officially abolished slavery in all areas of the United States: The 13th Amendment to the United States Constitution, ratified on December 6, 1865, abolished slavery and involuntary servitude, except as punishment for a crime.
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Granted African American men the right to vote: The 15th Amendment, ratified on February 3, 1870, prohibits the federal and state governments from denying a citizen the right to vote based on "race, color, or previous condition of servitude." This granted African American men the legal right to vote, although various discriminatory practices would still be used to disenfranchise them for decades.
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Granted African Americans in the United States citizenship: The 14th Amendment, ratified on July 9, 1868, granted citizenship to "all persons born or naturalized in the United States," which included former slaves recently freed after the Civil War. This amendment also ensures equal protection under the law.
These amendments were crucial in the legal advancements for African Americans in the United States following the Civil War.