Answer:
Below
Step-by-step explanation:
They were usually not protected and were very prone to U Boat attacks from Germany. However, after the sinking of Lusitania which had killed the lives of many American due to submarine warfare, they had started to equip torpedos to their ships. The strong naval presence in the waters also kept the supply ships safe to bring to Europe. As well as this, advancement in technology like improved sonar also made it easier to spot the U boats. Depth charges also stopped many operations of U boats.