What was built to connect mainland Florida to the Florida keys ?

I think the overseas highway

the overseas highway

Explanation:the over sea highway connected all of the mainland and its one of the longest oversea road in the world

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.