In 1943, which Allied conference established defeating the U-boat threat as the primary naval goal?

• A. Casablanca Conference
• B. Tehran Conference
• C. Yalta Conference
• D. Potsdam Conference

Answer: (A)

The key idea here is understanding how Allied leaders prioritized naval strategy to win the war at sea. In 1943, the Battle of the Atlantic was the lifeline of the Allied war effort, and German U-boats were wreaking havoc on shipping routes vital for troops, fuel, and materiel. At the Casablanca Conference, Roosevelt and Churchill made defeating the U-boat threat the central naval objective. This meant sharpening anti-submarine warfare, expanding convoy protection, extending air cover over Atlantic lanes, and coordinating better with air and surface forces to hunt and destroy U-boats. Securing those sea lanes was essential for sustaining operations in Europe and for enabling eventual land invasions.

This conference also covered other strategic moves—such as planning for the invasion of Sicily and continuing the push toward unconditional surrender—but the emphasis on destroying the U-boat menace defined the naval effort at that moment. Other conferences later in the war focused on different questions: Tehran dealt with opening a Western Front and coordinating with the Soviet Union, while Yalta and Potsdam addressed postwar order and occupation.