The correct answer is "Americans were humiliated by British impressments and Britain’s support of Native Americans."
The War of 1812 was a conflict between the United States and Great Britain. This war is seen as an extension of the Napoleonic wars which were occurring in Europe.
The anti-British sentiment was high in 1811, as the naval blockade exercised by the Royal British Navy prevented the Americans to do any trade with France. This led to a series of incidents in which the British impressed or forced commercial ships to fight for the British. It was also known that the British aided Native Americans in their efforts against the Americans. Both of these situations prompted the United States to attack the British northern colonies in 1812.