Final answer:
Former Confederate states needed to repeal ordinances of secession, ratify the Thirteenth Amendment, and follow the guidelines of the Wade-Davis Bill to rejoin the Union after the Civil War.
Step-by-step explanation:
To reenter the United States after the Civil War, under Radical Reconstruction, former Confederate states were not required to have former Confederate leaders, like Alexander Stephens, serve in Congress. Instead, these states needed to hold state conventions to repeal their ordinances of secession and ratify the Thirteenth Amendment. Additionally, they were presented with the Wade-Davis Bill, which required fifty percent of voters to swear an 'iron-clad' oath of loyalty, the drafting of new constitutions that abolished slavery, barred Confederates from voting or serving in government, and repudiated Confederate debts.