What did the southern states have to do under congressional reconstruction?

Under Congressional Reconstruction, Southern states were required to draft new constitutions that guaranteed civil rights and suffrage for African American men. They had to ratify the 14th Amendment, which granted citizenship and equal protection under the law, and the 15th Amendment, which prohibited denying the right to vote based on race. Additionally, Southern states had to be governed by military oversight until they complied with these requirements and demonstrated a commitment to the Reconstruction policies.