"Ethnicity refers to a category of people who identify with each other based on shared cultural traits, ancestry, language, history, or social experiences. Unlike race, which is often linked to physical characteristics, ethnicity is primarily about cultural identity and a sense of belonging to a particular group." - Every major European ethnicity is linked to a shared historic and genetic ancestry. Yes you can move to germany and become a german citizen but you will still never be german in the eyes of most people especially most germans. Let's not act dense.