The two major economic consequences of the War of 1812 were... 1) European nations began to think twice about interfering with US international trade. In fact, after the War of 1812, such interference was drastically reduced. (Of course, this had as much to do with Britain no longer seeing a need to interfere with our trade). 2) American manufacturing in the North increased dramatically.British (and French) interference with our trade before the War of 1812 and then the embargo and finally Britain's blockading our ports during the war led to What were the consequence of war of 1812?increased DOMESTIC manufacturing - esp in the North. This strengthened America's industrial economy