Dear Student
a) Unitary government: A unitary state is a state governed as one single power in which the central government is ultimately supreme and any administrative divisions exercise only powers that their central government chooses to delegate. The majority of world have a unitary system of government.
b) Coming together federation: It is a Federation in which several independent states come together on their own to form a bigger unit, so that by pooling sovereignty and retaining identity, they can increase their security. This type of federation is there in the USA, Switzerland and Australia.
c) Holding together federation: This type of federation exists in India, Spain, Belgium, etc. In this case, power is shared among various social groups to accommodate a huge diversity. In this type of federation, the central government is more powerful than the state government. Eg. India.
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