regionalism

Short definition from Wiktionary

Noun

1. 1
   Affection, often excessive, for one's own region and to everything related to it.
2. 2
   The belief that most or nearly all political power should be decentralized to regional governments.
3. 3
   A word or phrase originating in, characteristic of, or limited to a region.
4. 4
   Regional character, local color.