The War of 1812 (and the war in Europe more broadly) had the effect of promoting domestic manufacturing in the United States. During the war, the British Navy blockaded much of the American coast. As had been the case during the embargo implemented under the Jefferson administration in 1806, this was potentially devastating for New England merchants, a fact that explains their strident opposition to the war. It also led to a dearth of British cotton cloth. Some New England businessmen decided to employ their capital in domestic manufacturing, and the result was massive investment in the cotton mills that began the Industrial Revolution in the United States.
In addition, the war created a sense of nationalism unlike anything that had previously existed. This provided the context for a series of measures by Congress and the state legislatures that were intended to promote the domestic economy. Politicians like James Madison, John C. Calhoun, and Henry Clay promoted the establishment of an "American System" that included a high protective tariff, investment in infrastructure, and the chartering of a national bank. This program was a reaction to what many Americans saw as a need for economic independence from Britain and Europe as a whole and was a direct effect of the War of 1812. So overall, the War of 1812 promoted the growth of industry and manufacturing in the United States.