Congress proposed the fifteen amendment, it forbid any state to deny any citizen the right to vote because of their race,color, or previous condition of servitude
The congress passed a Radical Reconstruction Act, it threw out the states government if they didn't follow through with the 14th amendment. It also split the south into 5 military districts.
In this election, Johnson did not want Republicans in congress. People mostly voted for Republicans to be in congress because they realized that better leadership needed to be taken.
The Black Codes are a series of law that limits an African American's rights. These laws made sure that the African Americans could not gain any political or economic power.