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Germany launched the U-Boat campaign in the Atlantic to blockade British supplies
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Germany declared a naval blockade to Britain
Many ships arriving at Britain or going out from it were sunk by German U-boots. This violated the Prize Rules of the Hague Convention and turned neutral opinion against the Central Powers. It was one of reasons for Brazilian’s entrance in the war later. -
A German torpedo attack sunk the RMS Lusitana
This had a loss of 1,000 lives being 128 Americans. This was a factor in bringing the US into the war -
Germany renewed unrestricted submarine attacks
After scaling down U-boat attacks after the Lusitania, Germany renewed unrestricted submarine attacks in February 1917 in an attempt to starve Britain and France into surrender.