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This event is significant because it is the spark that starts the whole war.
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Austria Hungary declares war upon Serbia. This is significant because it is the first declaration of war and because Russia mobilizes its troops in preparation of war.
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The Germans obtain victory of the British Expeditionary Force and the French Fifth Army. This is an important event because it is the first major battle of the war.
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Germans began using unrestricted warfare against merchant ships. This changed the war because now civilians were being killed and it also altered the amount of help the US could send across the pond.
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This was the biggest naval battle fought during WW1, this is what makes it something that changes the course of war too. The battle was fought for 72 hours with over 100,000 men and 250 ships.
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This was an important event because it was the bloodiest battle of the war. With over 485,000 British and French casualties, and over 630,000 German.
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The US joins its allies; Britain, France, and Russia. This changes the course of the war because America has always been, and always will be the worlds greatest fighting force. We won the war for them.
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President Woodrow Wilson outlines his 14 points. This changed the war because the effort started to shift more towards peace rather than mass slaughtering.
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The League of Nations is finally accepted throughout the major world powers. This is very important because now they will work together to promote peace and to prevent war.
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Peace treaty signed between the Allied forces and Germany. This was a significant event because it brought an end to the war.