Why had relations between the United States and Great Britain deteriorated by the summer of 1812?
 - Americans were angry about the impressment of American soldiers into the British Navy during the Napoleonic Wars.
 - Britain had dramatically reduced the amount of raw materials they purchased from the United States.
 - The two nations disputed the location of the northern border of the United States.
 - The British had agreed to supply Tecumseh's forces with military supplies.