It showed that the U.S. was a nation hunting for heads, it was a war over Canada, fought by the British and the U.S., and ultimately hurt us. We lost that war (according to some, it was a stalemate), and (if I'm not mistaken) the white house was burned down. I'm sorry if I'm wrong, hope this helps you.
During the primary election process, candidates strive to get chosen to become a candidate of the general election, and aim to get the most support by the people.