The War of 1812: 12 things to know

United States becomes a world power

US sailors are forced into service

Free trade between nations is forbidden

President Madison leads the nation into war

United States invades Canada

War erupts on the high seas

War arrives on the Great Lakes

Washington, DC, goes up in flames

British attack Baltimore

Peace treaty signed on Christmas eve

Americans win final battle at New Orleans

War's end leaves important changes

Key dates.