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Germany and Austria were considered responsible for the war, they were excluded from the summit
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Russian army retreated as a consequence of the Bolshevik Revolution.
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United States entered the war in support of the Allied Forces.
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Italy entered the war in 1915, fighting together with the Triple Entente.
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Franz Ferdinand was the heir to the throne of Austria, was assassinated with his wife on June 28 1914 by Serbian student in Sarajevo so Austria declared war on Serbia and Russia and France.
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Germany invaded neutral Belgium in order to attack France, also Britain intervened against Austria and Germany.
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The global war caused countries great losses and, in 1919 the victorious nations took part in a post- war summit in Paris.