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The unrestricted submarine warfare impacted World War 1 since the Germans would send off their submarines to sink any other submarines whether it's neutral or not. This was a major factor for the US on joining World War 1. These ships would soon be created by many other countries that would take battles on the sea instead of just land.

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Submarines were remotely operated. Submarines were extremely deadly. They were capable of sinking enemy ships in a matter of minutes. In these Submarines they have a full armory loaded with hundreds of guns and turrets.

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Submarines were used In the Oceans all over the world during WWI to Surprise attack their enemies or sink enemy ships

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At the time these submarines were basically used and built for battle on sea especially the Germans using it for combat. The Germans also used it to prevent England from gaining supplies and resources. For this it caused submarine warfare Later it was known to create other submarine warfare such as the unrestricted submarine warfare.

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Submarines are vessels that would be able to navigate under water, which was really useful during wars. The German forces used these submarines that sank five British cruisers.

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In March 17, 1917, The Germans had submarines to sink three American merchant vessels which declared war between the US and Germany. Submarines were invented even before World War 1, the years of 1750´s was the idea of submarine being created.

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The inventor of the submarine was Cornelis Drebbel