Referred to as the "blank check", Kaiser Wilhelm II pledged Germany's unconditional support of whatever action Austro Hungaria may take in regard to the crisis with Serbia.
A war council between the countries was held at Potsdam to discuss possibilities of war with Serbia, Russia, and France. It concluded that eliminating Serbia was a necessity, with Emperor Franz Joseph claiming war was necessary to preserve the dual monarchy.
So, a war was deemed necessary over the murder of a man he didn't like, and the Austro Hungarians didn't either.
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