What led to resentment and violence among many white Southerners after the Civil War? the rewriting of state constitutions the attempts to end the Ku Klux Klan the policies of the Democratic Party the policies of the Republican Party

It was primarily "the policies of the Republican Party" that led to resentment and violence among many white Southerners after the Civil War, since these policies aimed at integrating the newly-freed blacks into southern society, which many democratic southerners deeply resisted.