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.
Chat with our AI personalities
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
Much of the East coast was blacked out as Nazi Uboats were sinking shipping all the way from NY to FL. They also did some shelling with their small deck guns.
Hitler intended to cut the sea lines between the US and Europe by having an armada of ships block the shipping channels. Hitler tried everything possible to cut the sea lines.
they are made of metal and they are also made of wood on the bottom
Well, since the US, has never been allied with Germany in any war other then Afghanistan, trading with them during the war would have been an act of treason and would have nothing to do with Britain anyway. Other then that, I imagine you could consider Most Favored Nation clauses, impeding any beneficial trade favors made towards new trade partners.