The correct answer: "People from the North that moved to the South after the US Civil War".
Carpetbagger was a pejorative denomination used by US citizens from the Southern states, former Confederates, to refer to people from the North who came to live in the South after the US Civil War. These "carpetbaggers" became targets of the white supremacist organization known as Ku Klux Klan because they supported the total integration in the US society of former slaves and they resided in the Southern states where the KKK operated.