Nationalism

Nationalism is a sense of ownership of a group of individuals to a political entity called a Nation. Many times it is an ethnic group. Often includes the belief that some States are superior to other states. Anyone who feels different is, obviously, because he feels superior. The Flemish feel superior to the Walloons, the Catalans feel superior to the Andalusian and Americans feel superior to everyone else. The rich feel superior to the poor and the Indians feel superior to the Pakistani.

The nationalist parties, which have no nation, need the central power to serve them as a counterweight. If there is no central authority, there are no comparative grievances. For, to whom should you to complain to if you feel aggrieved? Without the Central State, a nationalist would have to invent it. A nationalist is only defined by opposition to another nationalist.Oviously, to prove you're different, you ought to put emphasis on the differential facts. 

Nationalism, in terms of marketing, is a segmentation of the vote market. First you create a need, either real or merely induced by advertising, and then there appear, like mushrooms in a rainy autumn day, political groups which purport to meet this need. 

They say we need a national identity as advertisers say you need milk with omega 3, both things will  give us comfort and happiness.