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Territorial Nationalism is an ideology, that one belongs to and identifies not with a particular ethnic group, but with his or her country of birth and/or citizenship.
For example, while an ordinary Nationalist Hungarian in Romania would identify with other Hungarians around the world and feel a connection to the country of Hungary, a Territorial Nationalist Hungarian in Romania would call himself a proud Romanian (in the sense of being someone who was born and raised in Romania) and identify with the country of Romania, while keeping his Hungarian culture and language, and emphasize his unique Romanian-influenced Hungarian culture, and how different it is from the culture of Hungary.
Your challenge is to make this kind of Nationalism more widespread in Eastern Europe after the fall of Communism.