Answer:
Unitary System of government
Federal System of government
Step-by-step explanation:
In unitary republics, the central government may produce (or abolish) administrative departments. Such factors operate only the authorities that the central government wishes to select. ... A great majority of the world's countries (UN member states) have a unitary system of government.
A federal system of government is one that distributes the authorities of government between the national (federal) administration and state and local administrations. The Constitution of the United States authenticated the federal system, also recognized as federalism.