Which is the largest ethnic group in San Francisco?

M: So you’re visiting San Francisco?
W: Yes, I just got here the day before yesterday, and you?
M: I’m a native.
W: Oh, really? All the people I meet here are tourists like me. I was beginning  to think that maybe there were no natives.
M: Well. San Francisco has a lot of different ethnic groups, so you might think you’re seeing a lot of foreigners. But in fact, the city has a population of about 700, 000 people.
W: What are the ethnic groups?
M: Well, after whites, the largest one is blacks.
W: I thought it was Chinese.
M: It’s true that San Francisco has the largest Chinese community outside Asia. But the black people there are more than Chinese.
W: That’s interesting. Don’t most of the Chinese people live in China-town?
M: Well, no, they live throughout the city, but Chinatown is definitely the center of Chinese culture here. That’s where you’ll find the best Chinese restaurants, bookstores, art theaters and things like that.
W: How about the Japanese? Doesn’t San Francisco have a large Japanese population too?
M: No, actually there are only about 12,000 Japanese people here, but we do have an area called "Japan town" that has Japanese restaurants and bookstores.
W: You seem to know a lot about this city.
M: Well, most San Franciscans think their city is pretty special. We like to talk about it. Besides, I teach ethnic history at the university here.
W: No wonder you know so much!