Why Did The British Blockades

In the War of 1812, blockades were some of the earliest tactics deployed by the British. While you would think that the U.S. Industry would not be affected, but it was.
Imports and exports were blocked from ports, which made the industry slower and weaker, but more advanced. The U.S. industry could not trade overseas, and were limited in materials, and not in advances.
The blockades closed off mostly northern ports at the beginning of the war, and all of the eastern ports at the end of the war. While the supplies were limited due to the blockades, the North was advancing in industry.
The British blockades proved effective production wise. The materials, goods, and services that would come to the United States were blocked, and most likely