One major problem the United States was suffering with when John F. Kennedy became president was HIGH UNEMPLOYMENT RATE.
After the united states bought the Philippians archipelago from the Spanish in a sum of 20 million dollars, the US occupation of the Philippines has been significant for molding the nation towards its independence. One of its major proponents is American leaders like Roosevelt and Twain who granted the Philippine Islands sovereignty.
From what I can recall, the Adams-Onis Treaty more or less gave Florida to the U.S. but it did not exactly end the Second Seminole War, which can be made obvious with the fact that there are Seminoles still living in Florida. I don't remember the Treaty having anything to do with the British since this treaty was between Spain and the U.S.
Basically, I believe the answer is B.
Minor party I not widely supported