I’m not a historian, but I think it’s likely that hunting subs with destroyers was, with the technology at the time, far more efficient than relying on submarines to hunt other submarines. Torpedos at the time were fire-and-forget, meaning a sub fired them and then they traveled in a straight line until they hit something or ran out of fuel. It would probably have been quite difficult for a sub to have directly attacked and destroyed another sub. In fact, direct sub-to-sub battles are exceedingly rare in all of naval history, and to my knowledge there have only been a couple of subs that were directly engaged and sunk by another sub, even to the present day.
The US did have a capable sub fleet, but just as the Germans used their U-boots to attack British shipping, we deployed our subs to the Pacific to attack Japanese shipping and naval vesssels.
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