vincedog23 vincedog23 19-04-2020 History contestada Which sentences about the American Civil War are true? Check all that are true. The Civil War was fought primarily over the issue of slavery. The Civil War was a war fought between European settlers and American Indians. After the Civil War, the Thirteenth Amendment was passed, and slavery was abolished throughout the United States. The war started shortly after several Southern states seceded from the United States.