Reconstruction occurred from 1865-1877 and involved rebuilding the South after the Civil War and re-admitting Confederate states to the Union. Lincoln's plan was for Southern states to form new governments once 10% of the population swore allegiance, except for Confederate leaders. However, after Lincoln's assassination, Congress and President Johnson clashed over reconstruction plans, with Radical Republicans believing the South must be punished and granting full citizenship and voting rights to African Americans. This led to the Military Reconstruction Act and imposition of military control over Southern districts.