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The assassination of the Archduke and because of this Austria declared War on Serbia
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Britain, in fear of to it's own safety, decided to join the war to fight Germany to crush them now instead of waiting later.
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Japan delcared war on Germany despite Germany thinking that it could relay on the Asian countries
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The Ottoman empire joined Germany and were known as the central powers.
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The Ottoman Empire arrested and killed many Armenian's because of the tension between them. They killed and arrested Millions of Armenian people. To put into perspective there number dropped from 2.13 million to 387,000.
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Britain, France, and Russia joined forces being known as the allied powers.
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US was already helping the allies and getting supplies for them but know the US join the Allies in fighting against Germany.
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Russia had to leave the war because of the collapse of there government. They were not doing very well against Germany before that because of the lack of technological improvements.
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Germany surrenders to the allies