Before we go further, agreed upon definitions are in order for Ethnicity, Culture, Citizenship, and Nationality.
Here are mine.Ethnicity
: An ethnic group or ethnicity is a population of human beings whose members identify with each other, on the basis of a real or a presumed common genealogy or ancestry. Culture
: A way of life of a group of people--the behaviors, beliefs, values, and symbols that they accept, generally without thinking about them, and that are passed along by communication and imitation from one generation to the next.Citizen
: A native or naturalized member of a state or nation who owes allegiance to its government and is entitled to its protection ( distinguished from alien ).Nation
: Nation may refer to a a community of people who share a common language, culture, ethnicity, descent, or history.
Sources in headings.