General Tso's Chicken is actually an American made Chinese dish. It is not even made in China. Same with trying to find Caesar salads in Itlay.
In fact, every chinese restaurant in America is westernized and tastes nowhere near the same as the dishes made in China.
Even in China Town you will not find a Chinese meal as authentic as how they make it in China. Close, but no cigar (or blunt, heh).