The U-boats were the name of the three boats that the Germans sunked.
Yes, and so the Germans couldn't use it against the rest of the world neither.
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U-Boats
Because the Germans started sinking or cargo ships with their submarines.
The germans
Because Germans attacked our ships......
i suppose you mean the u-boat (unterseeboot) it's a submarine that the Germans used to sink the allies ships they even used them to sink the Lusitania which had American passengers on it and they all died.
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Allied cargo ships were the Germans primary targets.
The Germans believed the ships were carrying war supplies to the Allies.
German U-boats repeatedly sank American ship and ships with Americans on board. The Germans were trying to form an alliance with one of the anti-American factions that was vying for control of Mexico.