During the final years of World War II, how did the Allies gain control of the North Atlantic?

The Allies gained the upper hand in the Battle of the Atlantic by improving their ability to detect and attack German U-boats. Better anti-submarine tools and tactics, including radar, sonar, and improved depth-charge methods, helped Allied forces protect shipping and sink more submarines. Fighter support alone does not explain how they countered the main threat: German U-boats.

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