Other forms: regionalisms
Regionalism is a political focus on one specific area of a country. In the U.S., the perceived difference between Southerners and New Englanders is one example of regionalism.
The term regionalism has many different meanings, depending whether you're talking about economics, international relations, local politics, or even language. It always has something to do with a relatively small (or homogeneous) geographical area, or region. Calling Coca-Cola "pop" or "soda" is a linguistic regionalism, language specific to a place. And focusing on the world's "Western" countries is also a kind of regionalism. Being loyal to just one region and its interests is yet another type of regionalism.