Historically, I can not recount any single submarine changing the course of the war. Collectively, yes, the submarine helped change the course of the war. However, it was the total collective of air, land and sea that won the war.
Perhaps it could be argued that the sinking of Shinano could have changed the course of the war. But, we will never know for sure. Only conjecture.
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“You're painfully alive in a drugged and dying culture.”
― Richard Yates, Revolutionary Road
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