Final answer:
The black codes, Reconstruction Act, and Plessy v. Ferguson were all laws and rulings after the Civil War that had significant impacts on the rights and treatment of black people.
Step-by-step explanation:
The laws enacted immediately after the Civil War that were designed to marginalize black people were known as the black codes. These codes were implemented by Southern states to restrict the rights and freedoms of newly freed African Americans.
The Reconstruction Act was another law enacted after the Civil War. It was intended to address the political and social reform in the South and ensure the protection of the rights of African Americans. This act divided the Southern states into military districts and required them to ratify the Fourteenth Amendment.
The Plessy v. Ferguson case, although not a law itself, was a Supreme Court ruling that upheld racial segregation in public facilities, paving the way for the enforcement of segregationist laws and policies.
Learn more about Post-Civil War laws for black people