The correct answer is D) Supreme Court decisions.
After the Reconstruction, the gains made by African Americans in the South were diluted or destroyed by Supreme Court decisions.
The Reconstruction period was the process to settles things after the Civil War and the way the Federal government integrates Southern states to the Union. After the Reconstruction, the gains made by African Americans in the South were diluted or destroyed by Supreme Court decisions. What happened was that the Supreme Court undid changes that favored African Americans and generated more violence in many Southern states.
