What is the difference between a federal system and a unitary system?

A federal system is a system of government in which power is distributed among different levels of government, such as state and local governments. A unitary system is a system of government in which all power is concentrated in the central government.

A federal system is more likely to be found in countries with a long history of political fragmentation and a strong sense of national identity. A unitary system is more likely to be found in countries with a strong central government and a history of centralized power.