American luxury ships worked together with the Triple Entente navy. A few luxury or goods ships would be grouped together with a naval ship, and the naval would provide a sort of "protection". This way, German U-Boats would less likely to attack and sink the luxury liners or goods ships.
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it helped the Americans more than anything. it helped to counteract the use of German u-boats and their campaigns.
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In the World War One era, it was vital for cargo ships to cross the Atlantic Ocean for the transport of supplies from the USA to Western Europe. The major danger in this was that German submarines were able to use torpedoes to sink ships, both military and merchant vessels. The ship sailing formation called a convoy was designed to protect ships in the convoy and to destroy German submarines.
Your teacher is probably referring to the "Convoy System" that was developed by the British Royal Navy & used by the Allies. It meant that merchant ships with the same cruising speeds traveled together in a group or "convoy". The group may be escorted by Navy warships that were capable of protecting the merchants from German U-boats, Q-ships, or surface raiders. Ships that were very slow, or fast would not travel in a convoy.
World war 1 became entrenched because of the alliance system
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