French subdivisions that have a (limited) freedom of administration are called territorial collectivities. Among them are regions, departments, communes, overseas collectivities, provinces (only present in New Caledonia) and the territorial collectivity of Corsica which belongs to no category (but is usually grouped with the regions). New Caledonia is unique as it is not a territorial collectivity. Citizens from all parts of France, including the overseas administrative divisions, vote in national elections (presidential, legislative), and all of the collectivities are represented in the Senate. In the Medieval period, the territory of modern metropolitan France was occupied by a complex mosaic of more or less independent entities. Their gradual incorporation into France may be followed in the article Territorial formation of France. Historically, France was divided into provinces; see Provinces of France.