What is the difference between a 'unitary' and a 'federal' system of government?
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A
In a unitary system, the central government holds ultimate authority; in a federal system, power is constitutionally divided between the central government and regional governments
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B
A unitary system has a single elected leader while a federal system has multiple co-equal leaders sharing power
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C
A unitary system uses proportional representation while a federal system uses first-past-the-post elections
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D
A unitary system has one constitution while a federal system allows each region to have its own separate constitution