The use by British and the Americans of a convoy system (40-70 ships) and the development of more effective anti-submarine weapons such as depth charges and radar helped protect Allied merchant ships.
a group of German uboats that hunted Allied and US ships
The Germans then threatened to use only Uboats for war and blew up a few ships.
items were in short supply for Britain because all their cargo ships bringing food and other things in from the US were torpeoded and sunk by the German UBoats
the u boat is a submarine. it was made to hit and sink British ships
They sunk American ships.
It sank up to 2,779 ships in world war 2
Sonar with the Americans having the advantage.
the Germans used uboats and kept torpedoing cargo ships so the inhabitants didn't get the supplies they needed
Uboats were made to attack and sink merchant ships carrying supplies to Great Britain. Germany knew if they managed to cut Britain's supplies off then they would be unable to continue the war. They did this by launching torpedos which blew holes in enemy ships under the waterline, causing them to take on water and sink. As the war progressed, more and more were built to combat military ships as well as merchant vessels. Hope this helps.
The operation to protect American merchant ships in the Atlantic before the US entered the war was called the Neutrality Patrol. It involved escorting and protecting merchant ships from attacks by German submarines.
Wilson entered WWI because the German Uboats were destroying Americas ships. Also the Germans sent the Zimmerman letter to Mexico to ask them to join the war. If they won Mexico would receive all the land in America.