Read the following passages and then answer the question. A unitary system is a form of government in which all power is concentrated in a central government. Lower levels of government, such as states, provinces, or local governments, can only exercise the powers that are given to them by the central government. A confederal system is a form of government in which sovereign states grant certain powers to the central government for specific purposes. A federal system is a form of government in which the governmental powers are shared by the central government and the territorial subdivisions, such as the states. The key differences in the distribution of power within each system center on the amount of authority and power that is held by the _____. president governor legislative branch central government