1. Impressment of American Sailors: British warships frequently stopped American ships and forcibly recruited American sailors into the Royal Navy. This practice, known as impressment, violated American sovereignty and angered many Americans.
2. Trade Restrictions: The British and French were engaged in the Napoleonic Wars, and both countries imposed trade restrictions that affected American trade. The British, in particular, enforced a blockade on France and its allies, which disrupted American trade with Europe.
3. War Hawks: A group of young, ambitious politicians in the United States, known as the War Hawks, advocated for war with Britain. They believed that a war would allow the United States to expand its territory and assert its independence from Britain.
4. Tecumseh's Confederacy: In the Northwest Territory, a Shawnee leader named Tecumseh was rallying Native American tribes to resist American expansion and encroachment on their lands. Tecumseh's alliance, known as Tecumseh's Confederacy, received support from the British.
5. Battle of Tippecanoe: In November 1811, an American military force led by General William Henry Harrison defeated Tecumseh's forces at the Battle of Tippecanoe. This victory further increased tensions between the United States and Britain.
These events, among others, contributed to the outbreak of the War of 1812, which officially began on June 18, 1812, when the United States declared war on Britain.