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France, Britian, and Germany
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Germany and Austria-Hungary, together with Ottoman Empire who controlled by the turks
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was visiting Bosnian capital Sarajevo. As he stepped from the crowd the Archduke was shot, Austria Hungary declared war on Serbia
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Germany invades Belgium using this plan. Called for a holding action against Russia, combined with a quick drive through Belgium to Paris.
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May 7, 1915 is when the U-boat was attacked, 128 Americans lost their lives during the tragedy, and Americans became outraged with germany because of the loss of life.
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first battle of the Somme began on July 1, 1916 till mid November. British suffered 60,000 casualties first day alone, final total of 1.2 million casualties.