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I think you mean the U-boats. And they were concerned, if you mean at the beginning of WWI, because the Germans were sinking ships without warning, including passenger ships, namely, the US ship Lusitania. The U-boats were also sinking ships from neutral countries. They made a promise to stop, but continued anyway. This led directly to the US entering WWI.
So, to make a long story short, they were sinking innocent ships.
What else can I help you with?
Why did us get in World War I?
german u boats were sinking us merchant ships
What were German you boats?
german U-boats were submarines. in German they are called Unterseeboot
What factor changed Woodrow Wilson's opinion about entering world war?
Americans were angry German U-boats had Killed U.S. citizens. -APEX ;)
Any Laws governing usage of U-boat technologies?
German U-Boats were not nearly as good as US Navy Gato Class submarines in WWII. Consequently, what U-Boat technologies might "any laws" be concerned with?
What were German boats known as?
U boats
How do you say boats in German?
boats: Boote
What German weapon affected the US and changed the course of World War 1?
U-boats.
Where the the German U-boats successfully operate after the US entered the war?
Atlantic, Caribbean, and Mediterranean
What was The first vessel carrying US passengers to be destroyed by German U-boats in 1915?
Lusitania
How did the US react when Germany attacked three us ships escorting shipments of arms to iceland?
the united states issued orders to shoot German u-boats on sight
How in 1941did president roosevelt tracked German you-boats for what?
Civilian boats were drafted into service along the US east coast-line and operated as "anti-submarine boats." (Observers/Scouts/Lookouts).
What are German U-Boats?
german submarines
