What impact did European diseases have on American Indian groups? The diseases forced mass migration. The diseases made them embrace medicine. The diseases prompted war with the Europeans. The diseases killed millions of people.

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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.

answer; provide for the common defense: