Unincorporated area
In law, an unincorporated area is a region of land that is not governed by a local municipal corporation; similarly an unincorporated community is a settlement that is not governed by its own local municipal corporation, but rather is administered as part of larger administrative divisions, such as a township, parish, borough, county, city, canton, state, province or country. Occasionally, municipalities dissolve or disincorporate, which may happen if they become fiscally insolvent, and services become the responsibility of a higher administration. Widespread unincorporated communities and areas are a distinguishing feature of the United States and Canada. In most other countries of the world, there are either no unincorporated areas at all, or these are very rare; typically remote, outlying, sparsely populated or uninhabited areas.
Autonomous communities of Spain
Once the autonomous communities were created, Article 145 prohibits the "federation of autonomous communities". This was understood as any agreement between communities that would produce an alteration to the political and territorial equilibrium that would cause a confrontation between different blocks of communities, an action incompatible with the principle of solidarity and the unity of the nation.