We all technically have at least one ethnicity and one nationality (some people have more than one). I would suppose many people on this forum have a ethnicities that are different from their nationality.
If you have to choose one, do you identify more with your ethnicity or your nationality. And if you come from multiple ethnicities or nationalities...which one do you identify more with?
Then of course, come the question of what exactly defines ethnicity? what distinguishes one from the other exactly?