How did the us defend shups against U boat attacks?

The U.S. defended ships against U-boat attacks during World War II primarily through the implementation of convoy systems, where merchant vessels traveled in groups escorted by naval warships. They also employed technological advancements like sonar and depth charges to detect and destroy submarines. Additionally, the U.S. used air cover from aircraft, which helped to spot U-boats and provide protection for merchant vessels. These combined efforts significantly reduced the effectiveness of U-boat attacks.