Unincorporated area
An unincorporated community is one general term for a geographic area having a common social identity without municipal organization or official political designation (i.e., incorporation as a city or town). There are two main types of unincorporated communities:Due to differences in state laws regarding the incorporation of communities, there is a great variation in the distribution and nature of unincorporated areas. Unincorporated regions are essentially nonexistent in seven of the northeastern states. All of the land in New Jersey, Connecticut, Massachusetts, New York, and Rhode Island, and nearly all of the land in New Hampshire, Pennsylvania and Vermont, is part of an incorporated area of some type. In these areas, types (and official names) of local government entities can vary. In New England (which includes five of those eight states, plus the less fully incorporated state of Maine), local municipalities are known as towns or cities, and most towns are administered by a form of direct democracy, such as the open town meeting or representative town meeting. Larger towns in New England may be incorporated as cities, with some form of mayor-council government. In New Jersey multiple types exist as well, such as city, township, town, borough, or village, but these differences are in the structure of the legislative branches, not in the powers or functions of the entities themselves.
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.