Yes as many as they could. The U boat blockade was intended to prevent supplies getting to Britain. It did not matter who owned the ships.
Britain prevented any supplies from getting to Germany by sea in WW1, the sinking of supply ships heading for Britain was the only way Germany could retaliate. The fact that some of those ships were American was incidental.
The Allies were the enemies of Germany; attacking them was a prudent act of war.
Germany, being part of the Central Powers and at war with Great Britain, had set up a blockade around Britain. While a cruise ship called Lusitania was going from America to Britain, German submarines spotted it, and although it was only legal for the ships to be searched, German U-boats simply torpedoed the Lusitania, killing 128 Americans and over 1,000 passengers in total who were on the cruise ship. Although it is true that Germany sent a warning to America and Germany had suspicions supplies were hidden in the Lusitania (to help Britain), it enraged Americans so much that the propaganda produced by this made anti-German sentiments reach their peak and in 1917, America declared on Germany and entered World War 1 on the side of the Ally Powers
The German telegram to Mexico and the sinking of U.S. merchant ships.
The United States new after Nazi Germany took over France that they would have to be invloved in the war, Great Britain would be alone with no help. Great Britain resisted the invasion and also succeeded. Also after Pearl Harbor the U.S declared war on Japan and its Aliies.
They said that they would destroy all ships going into Great Britain.
Zeppelins: large air ships used by Germany to bomb Britain. Very vulnerable to attack.
by 1914 Britain had 250 ships compared to Germany's 56 ships.
Britain prevented any supplies from getting to Germany by sea in WW1, the sinking of supply ships heading for Britain was the only way Germany could retaliate. The fact that some of those ships were American was incidental.
Germany had invaded Belgium and was aiming to France. He took many ships into the Belgium ports so Britain declared to be threatened by the German ships in the Belgium ports. So Great Britain entered the war with France (something which Germany didn't expect).
It didn't defeat the RAF for control of the skies over the English channel to safeguard a convoy of invasion ships. Hitler withdrew planes and support troops from France to fight against Russia.
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 Allies were the enemies of Germany; attacking them was a prudent act of war.
They were supplying Germany's enemy...Great Britain.
The Germans believed the ships were carrying war supplies to the Allies.
When Germany starting cutting off Britains food supply by sinking their merchant ships, the U.S sent over their own merchant ships to Britain.
German u-boats attacked the ships by going up to them and shooting cannons at them and then the ships would fall deep under the sea.