"Austria-Hungary<span> declared war on </span>Serbia<span> after serbian nationalists assassinated Archduke Franz Ferdinand and his wife, this was not necessary as only a few serbians participated and these assassinations usually did not result in war" (prezi.com)</span>
He supported it because he believed that the powers enumerated in it balance each other out and nobody could become tyrannical by exploiting it. He refers to it as an open door because it can be amended meaning that if something needs to be changed because the spirit of the time has changed, it can be done while keeping the good things.
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