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Russia was bound by treaty with Serbia, Montenegro declared war on Austria-Hungary. Germany declared war on Russia.

France bound by treaty with Russia declared war on Germany, Great Britain declared war on Germany after Germany refused to respect the neutrality and sovereignty of Belgium.

United states tried to stay neutral but were to threatned by Germany's submarine attacks on Trade vessels to Germany's enemies.

Japan had a military agreement with Britan, so declared war on Germany.

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13y ago

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