The three different systems of government have varying advantages and disadvantages. Unitary governments are often described as centralized governments. It is a government in which all powers are held by a single, central agency. Most governments in the world are unitary. A Federal government is one in which the powers are divided between a central government and several local governments. The United States is an example of a Federal government. A Confederate government is an alliance of independent states. A central agency has the power to handle only those matters assigned to it by the member states. The Confederate States of America was an example of a Confederate government.Unitary governments are often described as centralized governm...