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The Archduke Franz Ferdinand was assassinated by a member of the Black Hand Serbian nationalist group.
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Austria-Hungary declares war on Serbia and Russia mobalizes.
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Germany declares war on Russia
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Germany declares war on France as part of the Schlieflen Plan.
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The Allies stop Germany from advancing to Paris in the Battle of Marne. The Germans dig trenches and trench warfare remains for the next four years.
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A German U-boat of the coast of Ireland sinks a British passenger boat, killing 1,198 people
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Located on both sides of the Somme river, as one of the bloodiest battles in the war, over 1 million men were lost.
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The British intercepted a telegram from Germany to Mexico that entailed discussion for a Mexican attack on U.S soil.
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After the Zimmerman telegram, the U.S decalres war on GERmany.
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In the middle of war, the Russian tzar is overthrown by the Bolshevic party.
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Germany and the allies agree to an armistice.
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The big four meet to determine the fate of the post-war central powers and begin the drafting of a treaty.