Unitary form of government: a system in which the central government exercises complete control and authority over subunits of government, which means that states or other governmental units do not have autonomous powers. Confederation: a system in which states or other types of government units organize a weak central government with limited scope and powers while reserving ultimate power for themselves. Unicameral form of government: a government system that consists of only one legislative body (rather than two or more) Concurrent powers: powers shared by the national government and state governments, such as the power to tax and borrow money. National government: a system of government in which powers are distributed between the central government (federal government) and subunits, such as states. Bicameral legislature: a legislature with two bodies, usually referred to as the upper and lower chambers, or, as is most common in the united states, the house and the senate.