In 1756, the major powers shifted their alliances and Prussia allied with Britain while France allied with Austria, a change known as the diplomatic revolution. ... All the participants of the Seven Years' War: [blue] Great Britain, Prussia, Portugal, with allies; [green] France, Spain, Austria, Russia, Sweden with allies.
In a unitary system of governenment, the local offices don't have much power. Instead, they rather follow the orders from the central government. So you could say that they are not independent, not even partially (like in feredal systems) and are therefore subject to the central government.