1812–1815: War of 1812: On June 18, 1812, the United States declared war against the United Kingdom. Among the issues leading to the war were British impressment of American sailors into the Royal Navy, interception of neutral ships and blockades of the United States during British hostilities with France, and support for Indian attacks on American settlers in the Northwest Territory. [RL30172] The war ended with the Battle of New Orleans in 1815.