Following Abraham Lincoln's assassination days after the war's end, President Andrew Johnson—a pro-Union, pro-states' rights Southerner—pursued a lenient approach to reconciliation. He pardoned former Confederates, restored their property, and allowed Southern states to govern with little federal oversight. Those states quickly enacted laws restricting the freedoms of formerly enslaved people, while groups such as the Ku Klux Klan targeted Black communities and leaders with violence.
In response, Congress defied Johnson's resistance—even impeaching him—and passed the Reconstruction Acts, which imposed military rule in the South and required new state constitutions guaranteeing civil rights and Black male suffrage. This ushered in a brief period of Black political participation in the South.
However, following the contested presidential election of 1876, Rutherford B. Hayes withdrew federal troops, effectively ending Reconstruction and allowing Southern Democrats to reestablish a racial hierarchy through Jim Crow laws.