I think race is the group of people divided by their color of skin and how they look. Japanese, Korean, Chinese, Vietnamese, and so on are separated into Mongoloid. But if you see them closer, they all look different.
Culture is the way of living. It includes art, religion, politics, and morality. Like Dr. Armstrong's example, the Japanese or people in other part's of Asia tend to wear masks when some disease is prevalent. But European, American don't really wear masks. I saw nobody wearing mask in the school when I lived in the U.S.A. I was really surprised at it. I don't even like wearing it. I would rather be absent from school than go to school in sickness.
I think tribe is the group which consists of people who are same race and have same culture. Even though the U.S. A consists of many ethnics, it's still a tribe. They may speak different language, have different religion, or eat their native country styled food. But still, they are living in same area, speaking English, and experiencing the U.S. A culture.
It's complicating!
