What is a Unitarian system of government?

A Unitarian system of government is a centralized political structure where power is concentrated in a single national government, which holds the authority over subnational entities like states or provinces. In this system, local governments derive their authority from the central government, and they can be created, modified, or abolished by it. This contrasts with federal systems, where power is divided between national and subnational levels, granting autonomy to local jurisdictions. Examples of countries with a unitary system include France and Japan.