Final answer:
The goal that united the Democrats in the South in the late 1800s was taking power away from the Republican Party.
Step-by-step explanation:
The goal that united the Democrats in the South in the late 1800s was Taking power away from the Republican Party. After the Civil War, the Republican Party dominated the South, and Democrats sought to regain political control in the region. They used various tactics, including paramilitary groups like the Ku Klux Klan, to intimidate and suppress Republican voters, particularly African Americans.