The American Civil War resulted in a significant historical transformation, particularly in regards to the social and political landscape of the United States. One of the most notable outcomes was the abolition of slavery, formalized by the 13th Amendment in 1865. The war also reinforced the federal government's power over the states, establishing the primacy of the national government. Additionally, it catalyzed movements for civil rights and economic change, paving the way for Reconstruction efforts aimed at integrating formerly enslaved people into society. The war fundamentally transformed American values and institutions, leading toward a more unified nation.