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The black hand gang a Serbian terrorist group assassinated the Austrian Archduke Ferdinand so Austria declared war on serbia russia declared war on austria so Germany declared war on russia so france declared war on germany so germany went through belgium to invade france.America joined in 1917 partly because the germans had sent a message to the mexicans to try and get them to conquer america.there were also many british possesions india Australia etc sending troops to help the british

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8y ago

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