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the united states declared to stay neutral during the war.
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the lusitania was an american trade ship that was sunk by german u boats. this was when the U.S. started to get involved in the war.
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made by germany to the US stating that they will no longer sink innocent american ships like trade ships, the lusitania.
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they started submarine war fare again before the US got involved in the war.
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from germany to mexico creating an allience with germany incase the US entered the war. later intercepted and decoded by the british
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merchant, sailing, and fishing ships were 3 types of ships lost during submarine war fare
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the US declared war against germany after trying to stay neutral