America declared war on Great Britain in 1812 due to British impressment of American soldiers, disputes over territories and borders, and British interference with American trade and blockades during the Napoleonic Wars.
1. Impressment of American Soldiers: The British practice of impressment, forcibly taking American sailors into British naval service, was a key factor leading to the War of 1812.
2. Disputes over Territories and Borders: Ongoing conflicts with Great Britain over the Northwest Territories and the Canadian border fueled tensions, as did the arming of Native American groups by the British against American settlers.
3. Interference with Trade and Blockades: British interference with American trade, including the imposition of blockades on France during the Napoleonic Wars, was a significant cause of conflict. The violation of American maritime rights and attacks on American vessels further fueled the decision to go to war.