Ulysses S. Grant retired from public service after the Civil War.
Ulysses S. Grant . Elected president in 1868 , he stabilized the nation during that turbulent period , prosecuted the Ku Klux Klan , and enforced civil rights and voting rights laws using the army and the newly created Department of Justice . Ulysses S. Grant was the most acclaimed Union general during the American Civil War and was twice elected President .