Causes of the War of 1812. ... Great Britain had violated American sovereignty by refusing to surrender western forts as promised in the Treaty of Paris after the Revolutionary War. 2.) Great Britain began stopping American sea vessels and forcing subjects on the vessels into the British military.
-- American merchants resented British barriers of trade with France.
-- Americans angered by impressment.
-- Americans believe the British pushed Native Americans to fight with American settlers.
-- Some members of the House of Reps wanted to expand into Canada.
-- American patriotism was boosted.
-- Native Americans were weakened.
-- Loss of trade encouraged American manufacturing.
-- United States proved that it could defend itself.
Hope i helped
effects: Am. indians sign peace treaties and decline of federalist