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June 28, 1914 was the  assassination of Archduke Ferdinand

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Austria-Hungary declared war on Serbia, Russia got involved to defend Serbia and it started in July 28, 1914 an world war 1 began. The reason why Austria declared war on Serbia was assassination of Archduke Franz Ferdinand

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Country built strong military to protect them selves up in the colonies.Tensions rose as countries watch each outer build up military power. European countries made e garments with each outer to better protect themselves.
When the war began,one side were allies        ;Great Britten,France,Russia,Serbia,and Belgium.Central powers were : Germany , Austria-Hungary , Bulgaria, and the Ottoman Empire .

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Facing dwindling resources on the battlefield, the Central powers surrender of to the allies, Germany was finally forced to seek harsh consequences losing land and money this November 11, 1918 ending World War 1 .

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The Great Depression was the worst economic downturn in the history of the industrialized world, lasting from 1929 to 1939. It began after the stock market crash of October 1929, which sent Wall Street into a panic and wiped out millions of inventors.