The Radical Republicans were a group of politicians in the Republican Party. They believed the Civil War should lead to lasting change in the United States. They were active before, during, and after the war, and they were especially focused on ending slavery and protecting the rights of formerly enslaved people. Many Radical Republicans came from the North and were connected to the abolitionist movement that had opposed slavery for decades.
Two key leaders of the Radical Republicans were Thaddeus Stevens and Charles Sumner. Stevens was a congressman from Pennsylvania, and Sumner was a senator from Massachusetts. Both men believed slavery was morally wrong and that freedom required more than just ending enslavement. They argued that the nation must protect African Americans after the war. This was especially important in the former Confederate states.

After the Civil War ended and President Abraham Lincoln was assassinated, Andrew Johnson became president. Johnson supported a plan for Reconstruction that focused on quickly restoring Southern states to the Union. He offered pardons to many former Confederate leaders and allowed Southern states to form new governments with little federal control. Radical Republicans strongly disagreed with this approach.
Radical Republicans believed Johnson’s plan was too forgiving toward the South. They were alarmed that former Confederate leaders were returning to power so soon after the war. They were worried about the Black Codes in Southern States. These laws took away the freedom of African Americans. They also limited their rights as workers and citizens.
Johnson believed that the end of slavery was enough and that states should control their own affairs. Radical Republicans disagreed. They felt that freedom would not be safe without federal protection. They said the federal government must protect equal rights for everyone. They also said it should prevent Southern states from returning to old control systems.
Radical Republicans and President Johnson disagreed about what the war meant. Johnson wanted a quick reunion. Radical Republicans wanted to reshape the nation and prevent injustice from continuing. Conflict between the two sides grew quickly during Reconstruction due to these differences.