1. Impressment of American sailors: The British Royal Navy stopped and boarded American ships, taking sailors they claimed were British subjects. This practice angered many Americans and was seen as a violation of their sovereignty.
2. Interference with American trade: The British blockaded American ports and restricted trade with other countries, which damaged the American economy. The British Orders-in-Council and other policies that favored British trade at the expense of American trade was a significant factor leading up to the war.
3. British support of Native American tribes: The British provided arms and supplies to Native American tribes that were fighting against American settlers. This support was seen as an act of aggression against the United States. Additionally, the British had established forts in the Old Northwest Territory, which the Americans considered a violation of the 1783 Treaty of Paris, which had ended the American Revolutionary War.