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Heir to the Austria-Hungarian throne, Archduke Franz Ferdinand is assassinated by a Serbian group called the Black Hand
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Austria-Hungary demands Serbia for retribution, after no demands are fulfilled, Austria-Hungary declares war on Serbia. Russia begins transporting troops.
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Germany declares war on Russia and France as part of the Schlieffen plan. They invade Belgium and in result British declares war on Germany.
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Germany attacks the Lusitania, a British luxury ship, with submarines.
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Germans begin to use u-boats(submarines) around Britain to sink Allied merchant ships.
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The Battle of Verdun begins between France and Germany.
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The largest naval battle of the war, the Battle of Jutland, is fought between Britain and Germany in the North Sea.
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The Battle of the Somme begins. Over 1 million soldiers will be wounded or killed.
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The British intercept the Zimmerman Telegram in which Germany tries to convince Mexico to join the war. This will result in the United States declaring war on Germany.
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The United States enters the war, declaring war on Germany.
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The Russians agree to peace with the Central powers and leave the war.
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President Woodrow Wilson issues his "Fourteen Points" for peace and an end to the war.
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Germany agrees to an armistice and the fighting comes to an end at 11AM on the 11th day of the 11th month.
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The Treaty of Versailles is signed by Germany and World War I comes to an end.