Answer:
The room is a salon, a lavish setting for fashionable gatherings.
Explanation:
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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The Ancient Greek had a government called Constitutional Republic. Which means, that the country is considered a "public matter, not the private concern or property of the rulers.
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When Augustus became the emperor this event changed roman from a republic to a empire <span />