What led the United States to invade Canada in June 1812?

Answer: Resentment of British interference with American shipping

Britain was fighting Napoleon, and after the Battle of Trafalgar (1805) its Royal Navy ruled the seas. Americans resented British interference with their shipping. Believing Canada would be easy to conquer, the United States invaded in June 1812, but by 1814 the invasion had failed.

Learn more: The War of 1812

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