I've always understood nationality to be something they stamp on your passport. A legal category you are assigned based on where you have naturalized. Ethnicities can exist within any given nation (for example, Russia, China, any Mid-east country will have a thousand different ethnic groups). If you are born in a Hispanic family in America where you speak Spanish to all your relatives, friends, classmates and you eat burritos and horchata everyday and wave the Mexican flag in front of your house....... are you Mexican or American? Depends on who you ask I guess. This doesn't get into cultural attitudes which I find to be separate from both nationality and ethnicity. Ask someone who has cousins back in their mother country about how they are. Same ethnic DNA, traditions, etc. but very different behavior/attitudes based on a myriad of factors pertaining to just existing in a different environment.

No, Venn diagrams are unnecessary. I understand what you are saying. Race is not a requirement for ethnicity.

Holy shit, I'm confused now.

I always thought of race as the biological component, and ethnicity as the cultural component.

For example: I always labeled myself under Asian for race, due to hair and eye color, facial structure, etc. On the flip side, I label myself ethnically as "American" due to heritage and upbringing.

This gets somewhat confusing with Asian people, particularly South-East Asian cultures who are not actually located in China but are considered "ethnic Chinese" from their cultural heritage.

Anax feel free to slap me upside the head if I'm just smoking something extra special.