Radical Reconstruction began when Congress took control of the rebuilding process from President Andrew Johnson. Republican lawmakers believed the South was not changing in meaningful ways under Presidential Reconstruction. As a result, Congress decided to direct Reconstruction itself. It used federal power to reshape Southern governments and protect basic rights.
One of Congress’s first actions was to expand the role of the federal government in protecting freed people. Lawmakers extended the work of the Freedmen’s Bureau, which provided schools and assistance with legal and economic issues. Congress also passed the Civil Rights Act of 1866. This law defined national citizenship and required that citizens receive equal treatment under the law. It protected basic rights such as making contracts, owning property, and having access to the courts. Federal courts and officials were given authority to enforce these protections when states failed to do so.

Congress also changed how Southern states were governed. In 1867, a series of Reconstruction Acts were passed. These laws divided the former Confederate states into five military districts, each overseen by federal commanders. The purpose was to maintain order and ensure that Reconstruction policies were carried out. Southern states had to create new governments. They also needed to fulfill certain conditions before they could return to Congress. Tennessee was the only former Confederate state not placed under military rule.
The Reconstruction Acts changed how people participated in politics in the South. They allowed Black men to vote in Southern elections before the Fifteenth Amendment was ratified. Elections were watched closely. This was to keep former Confederate leaders from gaining control. States were expected to create new constitutions and demonstrate loyalty to the Union. Congress believed these steps were needed to build stable governments and prevent a return to prewar power structures.
During this time, Congress suggested amendments to the Constitution to help reach its goals. The Thirteenth Amendment abolished slavery except as punishment for a crime. The Fourteenth Amendment addressed citizenship and equal protection under the law. The Fifteenth Amendment later prohibited denying the right to vote based on race. These amendments provided a constitutional foundation for Reconstruction but were only one part of Congress’s broader plan.

Reconstruction governments in the South made additional changes. They established state-funded public schools and advocated equal taxation. They also banned racial discrimination in buses and hotels. At the same time, opposition to Reconstruction increased, including violent resistance against African Americans and Republican officials.
Conflict between Congress and President Johnson continued throughout this period. Johnson vetoed Reconstruction laws. He also challenged limits on his authority. In 1868, the House of Representatives impeached him. They charged him with obstructing Reconstruction and breaking federal law. The Senate held a trial but did not remove him from office.
