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Submarines were neither practical nor necessary for the Allied side in the Atlantic Theater. This was mostly because the German Navy was heavily outgunned by the British Royal Navy and the Americans, and received almost no supplies from cross-Atlantic shipping, so there were relatively few targets for Allied submarines to go after.
Britain depended on heavy aid across the Atlantic, however, so German U-Boats attacked merchant ships relentlessly, and the Allies concentrated on building the cargo transports and the destroyer escorts needed to protect them as opposed to submarines.
In the Pacific, the entire war was fought over islands, all of which had to be supplied by sea, so submarines use by both the Japanese and the Americans was a much more natural and necessary strategy. So it made much more sense to concentrate all of America's submarine forces in the Pacific.
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