Pax Romana was The period in which the Republic ruled Rome
The time of war
The peace that lasted during the Empire
The Time of Chaos during the collapse of Rome

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an informal structure in a bureaucracy would be something like so-called "office politics". where there's a formal structure set up for the organization, but then an informal subculture as well that has a way of organizing the bureaucracy further. this can be positive because it sets up an added degree of organization, albeit informal, within the bureaucracy.