Banks and governments alike would struggle to give up control to a distant banking regulator that might, for instance, tell national champions to reduce their exposures to domestic housing markets or make fewer loans to small businesses in order to cut risk.
Tower closures would not necessarily result in airport closures, because some aircraft can land without air traffic control help, and those that need controller help can communicate with more distant FAA facilities.
Spaniards are far from proud of their military record over the past century and have no yearning for the more distant days when the conquistadores took South America or when swathes of Europe were under Spanish control.