Just saw this awesome piece over at Racialicious, originally posted here, summarizing the popular myths that non-Chinese Americans have about Chinese food in the United States: White American Culture is General Tso's Chicken and Chop Suey.
Basically, most of what white Americans consider "Chinese food" is mostly eaten by white people, and would probably be more accurately described as "American food" (and perhaps even "white people food"). American as apple pie.
Check out this great video with Jennifer 8. Lee, author of the highly informative and entertaining The Fortune Cookie Chronicles, who has become sort of an expert all things Chinese food, dropping some serious knowledge about America's true favorite cuisine.