Final answer:
Despite substantial early losses, the U.S. Navy recovered and gained control of the Atlantic by 1943, using innovations like sonar and the convoy system to neutralize the German submarine threat. This facilitated the secure transportation of troops and resources critical for the Allied victory in World War II.
Step-by-step explanation:
The question appears to be referencing the effectiveness of the United States Navy in recovering from significant naval losses and the overall impact of U.S. naval actions by the end of World War II. During World War II, the U.S. faced substantial naval losses, such as the attack at Pearl Harbor where four battleships were destroyed, four severely damaged, and 340 aircraft destroyed. However, the U.S. Navy was able to recover and, by 1943, effectively controlled the Atlantic Ocean. This control allowed military officials to concentrate resources in preparation for major offensives. The German submarine threat, significant early in the war, was countered by American innovation like sonar and the convoy system, which drastically reduced U-boat effectiveness and increased Allied shipping security. Furthermore, the convoy system and sonar led to a point where U.S. warships were able to destroy more German submarines than were being produced, ensuring the safe transport of U.S. troops and materials to Europe.