A political unit is a type of administrative division that is used to govern a population. A NATION is the largest type of political unit, typically consisting of a large area and a large population. A BLOC is a smaller type of political unit, usually consisting of several nations that are united by a common goal or purpose. A DISTRICT is a smaller political unit, typically consisting of a smaller area and population than a NATION. Finally, a TOWNSHIP is an even smaller political unit, usually consisting of a small area and population.