Unitary state

The modern unitary state concept originated in France; in the aftermath of the Hundred Years' War, national feelings that emerged from the war unified France. The war accelerated the process of transforming France from a feudal monarchy to a unitary state. The French then later spread unitary states by conquests, throughout Europe during and after the Napoleonic Wars, and to the world through the vast French colonial empire. Presently, prefects remain an illustration of the French unitary state system, as the representatives of the State in each department, tasked with upholding central government policies.

Unitary states stand in contrast to federations, also known as federal states. A large majority of the UN member countries, 166 out of 193, have a unitary system of government, while significant population and land mass is under some kind of federation.

Devolution compared with federalism

A unitary system of government can be considered to be the opposite of federalism. In federations, the provincial/regional governments share powers with the central government as equal actors through a written constitution, to which the consent of both is required to make amendments. This means that the sub-national units have a right to existence and powers that cannot be unilaterally changed by the central government.