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The Archduke of Austria-Hungary, Franz Ferdinand was assassinated by a Serbian. This marked the first act of the war, and was the start of World War I.
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Germany attacks Belguim. This is significant because Belguim is a friend of Great Britain, and the attack gets them involved in the war also.
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The Germans sunk a ship by the name of the Luistania. 1,198 passengers were on the ship and died. 128 of those people were Americans. This really upset people, especially Americans.
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Tanks are used by the very first time by Great Britain. This is significant because at this point, weapons were advancing a lot, and using tanks was a whole new level.
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This was one of the battles that took place during WWI. It was significant because it was the longest battle of WWI, lasting close to a year long.
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The United States joins World War I and allies with Great Britain and France. This is significant because it took a while for the U.S. to join and they finally did 2 years after the war started.
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This act called or a draft in the United States. This meant that people would be forced to go into war. This was significant because Americans were angry that they were being forced to send their husbands, dads, sons, and themselves into war.
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This was the final battle of WWI. This is significant because it was the very last battle, and there would be no more fighting during WWI.
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Germany signs an Amistice with the Allies, and this is significant because it meant the fighitng and war was offically over.
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The Treaty of Versailles was the end to World War I. This was significant because, with it's signing, the war was finally over.