What specific trait gives the us a presidential system of government?

The written constitution gives the us a presidential system of government.

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explanation: 3fgtgetg

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.