Federalism (also called federal system) is a political philosophy in which a group of members are bound together (Latin: foedus, covenant) with a governing representative head. The term federalism is also used to describe a system of the government in which sovereignty is constitutionally divided between a central governing authority and constituent political units (like states or provinces). Federalism is a system in which the power to govern is shared between national and central(state) governments, creating what is often called a federation. Proponents are often called federalists.