I'm pretty sure it's like this for every cousine.

The bottom line is that restaurants have to have a theme, right, how else would anyone even talk about it? And the theme is usually some region of the world with varying specificity, my favorite is "fusion," where the restaurant has two, or even three themes. When you go to a place with any theme, it's always a charicature. In the case of restaurants, I've found that the food rarely represents the daily cuisine of the regular people of whatever place or tradition, it's rather the cuisine of a restauranteur trying to run a business.

It's a few choice special dinner dishes, like Sunday or holiday meals, and a few chubby-kid approved favorites, and it seems just as often it's stereoptyical dishes that may not even be from the place/culture, such as General Tso's Chicken, that came from one Hunanese resteraunt in New York in 1972, and is now in the menu if every Chinese restaurant in America. And American restaurants abroad serve franks and hamburgers, despite the origins of both being in Frankfurt and Hamburg, Germany. In sum, there are no rules and everything is made up. You can get New Haven style pizza in Rome.