What four factors helped Allies win the Battle of Atlantic?

The Allies won the Battle of the Atlantic due to several key factors: improved anti-submarine warfare tactics, including the use of depth charges and sonar technology; the introduction of the convoy system, which protected merchant ships from U-boat attacks; advancements in naval technology, such as escort carriers and long-range aircraft; and effective intelligence operations, including code-breaking efforts that allowed the Allies to anticipate and counter German U-boat movements. These combined efforts significantly diminished the effectiveness of Germany's submarine campaign.