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United Kingdom declares war on Germany after Germany invade Belgium
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From September 6-12, 1914, just one month into World War I, the First Battle of the Marne took place just 30 miles northeast of Paris in the Marne River Valley of France.
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Though World War I had been raging for only four months, it was already proving to be one of the bloodiest wars in history. Soldiers on both sides were trapped in trenches, exposed to the cold and wet winter weather, covered in mud, and extremely careful of sniper shots. Machines guns had proven their worth in war, bringing new meaning to the word "slaughter."
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On May 7, 1915, the British ocean liner RMS Lusitania, which primarily ferried people and goods across the Atlantic Ocean between the United States and Great Britain, was torpedoed by a German U-boat and sunk. Of the 1,959 people on board, 1,198 died, including 128 Americans. The sinking of the Lusitania enraged Americans and hastened the United States' entrance into World War I.
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The Battle of the Somme was fought during World War I (1914-1918).
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Definition: Refers mainly to the alliance of Germany, Austria-Hungary, the Ottoman Empire and others in World War One, but can refer to the 'Triple Alliance' of Germany, Austria-Hungary and Italy in 1882. The name derives from the nations' geographic position: down the centre of Europe. Examples: In 1917 the United States declared it would enter the war against the Central Powers.
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