Answer:
Federation is the correct answer.
Step-by-step explanation:
A federation can be defined as a political entity consisting of states, self-governing provinces and other regions under a strong central government. In a federation, the status of states and the division of power between the state and the center is mentioned in the constitution and cannot be altered by any party. The government found in a federation is all federalism. It is the opposite of unitary form. A unitary system is present in France, while the Federal system in the USA.