Ghana is Unitary State. A Unitary state is one in which the central government is supreme and possesses a complete governmental power.
The central government is all powerful and there is only one central legislature that makes laws for the whole country. It then stands to reason that the central government is the only source from which power Emanets.
Examples of countries operating unitary system of government include: Britain, Italy, France, Belgium, New Zealand, Sweden, Gambia, Sierra Leone, Ethiopia Togo, Cameroun, Kenya, Ghana under Nkurumah, etc.