Briefly explain one reason for the rise of african slavery in the british colonies. 17th and early 18th centuries

Cash crops are the main import and export for America.

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.