Your queries correspond to the following Constitutional amendments:
-
Query 1 (officially abolished slavery in all areas of the United States): This refers to the 13th Amendment.
-
Query 2 (granted African American men the right to vote): This refers to the 15th Amendment.
-
Query 3 (granted African Americans in the United States citizenship): This refers to the 14th Amendment.
If you have any further questions or need more information, feel free to ask!