Cultural area
In anthropology and geography, a cultural region, cultural sphere, cultural area or culture area refers to a geography with one relatively homogeneous human activity or complex of activities (culture). Such activities are often associated with an ethnolinguistic group and with the territory it inhabits. Specific cultures often do not limit their geographic coverage to the borders of a nation state, or to smaller subdivisions of a state. Cultural "spheres of influence" may also overlap or form concentric structures of macrocultures encompassing smaller local cultures. Different boundaries may also be drawn depending on the particular aspect of interest, such  as religion and folklore vs. dress and architecture vs. language. History of concept. A culture area is a concept in cultural anthropology in which a geographic region and time sequence (age area) is characterized by substantially uniform environment and culture. The concept of culture areas was originated by museum curators and ethnologists during the late 1800s as means of arranging exhibits. Clark Wissler and Alfred Kroeber further developed the concept on the premise that they represent longstanding cultural divisions. The concept is criticized by some who argue that the basis for classification is arbitrary. But other researchers disagree and the  organization of human communities into cultural areas remains a common practice throughout the social sciences. The definition of culture areas is enjoying a resurgence of practical and theoretical interest as social scientists conduct more research on processes of cultural globalization. Types. A formal culture region is an area inhabited by people who have one or more cultural traits in common, such as language, religion, or system of livelihood. It is an area relatively homogeneous with regard to one or more cultural traits. The geographer who identifies a formal culture region must locate cultural borders. Because cultures overlap and mix, such  boundaries are rarely sharp even if only one cultural trait is mapped and so there are cultural border zones, rather than lines. The zones broaden with each additional cultural trait that is considered because no two traits have the same spatial distribution. As a result, instead of having clear borders, formal culture regions reveal a center or core, where the defining traits are all present. Away from the central core, the characteristics weaken and disappear. Thus, many formal culture regions display a core-periphery. In contrast to the abstract cultural homogeneity of a formal culture region, a functional culture region  may not be culturally homogeneous; instead, it is an area that has been organized to function politically, socially, or economically as one unit: a city, an independent state, a precinct, a church diocese or parish, a trade area or a farm. Functional culture regions have nodes or central points where the functions are coordinated and directed, such as city halls, national capitols, precinct voting places, parish churches, factories, and banks. In that sense, functional regions also possess a core-periphery configuration, in common with formal culture regions. Many functional regions have clearly defined borders that include all land under the  jurisdiction of a particular urban government that is clearly delineated on a regional map by a line distinguishing between one jurisdiction and another. Vernacular, popular or perceptual cultural regions are those perceived to exist by their inhabitants, as is evident by the widespread acceptance and use of a distinctive regional name. Some vernacular regions are based on physical environmental features; others find their basis in economic, political or historical characteristics. Vernacular regions, like most culture regions, generally lack sharp borders, and the inhabitants of any given area may claim residence in more than one such region. It grows out of  people's sense of belonging and identification with a particular region. An American example is "Dixie". They often lack the organization necessary for functional regions although they may be centered on a single urban node. They frequently do not display the cultural homogeneity that characterizes formal regions. Allen Noble gave a summary of the concept development of cultural regions using the terms "cultural hearth" (no origin of this term given), "cultural core" by Donald W. Meinig for Mormon culture published in 1970 and "source area" by Fred Kniffen (1965) and later Henry Glassie (1968) for house and barn types. Outside  of a core area he quoted Meinigs' use of the terms "domain" (a dominant area) and "sphere" (area influenced but not dominant). Cultural boundary. A cultural boundary (also cultural border) in ethnology is a geographical boundary between two identifiable ethnic or ethnolinguistic cultures. A language border is necessarily also a cultural border, as language is a significant part of a society's culture), but it can also divide subgroups of the same ethnolinguistic group along more subtle criteria, such as the Brünig-Napf-Reuss line in German-speaking Switzerland, the Weißwurstäquator in Germany or the Grote rivieren boundary between Dutch  and Flemish culture. In the history of Europe, the major cultural boundaries are found: Macro-cultures on a continental scale are also referred to as "worlds," "spheres," or "civilizations," such as the Muslim world. In a modern context, a cultural boundary can also be a division between subcultures or classes within a given society, such as blue collar vs. white collar etc. Role in conflict. Cultural boundaries sometimes define the difference between friend and foe in political and military conflicts. Ethnic nationalism and pan-nationalism sometimes seek to unify all native speakers of a particular language, who are conceived of  as a coherent ethnic group or nation, into a single nation-state with a unified culture. The association of an ethnolinguistic group with a nation-state may be written into nationality laws and repatriation laws, which establish eligibility for citizenship based on ethnicity, rather than place of birth. In other cases, attempts have been made to divide countries based on cultural boundaries by secession or partition. For example, the Quebec sovereignty movement seeks to separate French-speaking province from English-speaking Canada to preserve its unique language and culture, and the Partition of India created separate majority-Hindu and majority -Muslim countries. Examples. Music. A music area is a cultural area defined according to musical activity. It may or may not conflict with the cultural areas assigned to a given region. The world may be divided into three large music areas, each containing a "cultivated" or classical musics "that are obviously its most complex musical forms," with, nearby, folk styles which interact with the cultivated, and, on the perimeter, primitive styles: However, he then adds that "the world-wide development of music must have been a unified process in which all peoples participated" and that one finds similar tunes and  traits in puzzlingly isolated or separated locations throughout the world.