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June 28th, 1914

Archduke Franz Ferdinand was assassinated by a Serbian nationalist terrorist group. This was the catalyst for WW1.

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July 28th, 1914

Austria-Hungary declares war on Serbia, officially starting WW1.

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August 24th, 1914

Germany crosses through Belgium on the path to France causing Britain to declare war on Germany due to the alliance between Britain and Belgium

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Sep 5, 1914 – Sep 12, 1914

The first battle of Marne was the first battle to introduce trench warfare.

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May 7th 1915

The Lusitania was a British boat that had 128 American citizens on board that were all killed by a Nazi U-boat attack

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Feb 19, 1915 – Jan 9, 1916

The battle of Gallipoli is commonly regarded as one of the most intense battles of all time for its intensity

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January 17th, 1917

America intercepts a telegram sent from Germany to Mexico asking to aid Germany in declaring war on America

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March 18th 1917-June 16th 1923

The Russian Revolution abolished the monarchy and established a socialist form of government.

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April 4th, 1917

The Congress agreed to declare war on Germany after the events of the Zimmerman note

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June 28th, 1919

The Treaty of Versailles marked the official end of WW1 with a treaty between countries.