The significant outcomes of the Civil War included the preservation of the Union and the abolition of slavery. The Union's victory in 1865 confirmed the United States as a single, unified nation and ended the Confederate rebellion. The war also resulted in the passage of the Thirteenth Amendment, which abolished slavery, transforming the social and economic landscape of the South. Additionally, the war set the stage for Reconstruction, a challenging period aimed at rebuilding the nation and addressing the rights of newly freed African Americans, laying the groundwork for future civil rights advancements.