Evaluate the sociological and political characteristics associated with the phenomenon of 'Regionalism' within the Indian context:
1. The phenomenon is defined by a pronounced sense of sub-nationalism, where civic affection for a specific region supersedes broader national loyalty.
2. The political agitation led by residents of certain Union Territories seeking elevation to full statehood serves as a direct expression of this concept.
3. The movement is historically spearheaded by the most dominant cultural demographics whose ideologies already saturate the national polity.