The diving exhibited by the Italians and the Mexicans are one reason why soccer probably isn't popular in this country. This blog post summarizes that theory very well...
"Nowhere was this [diving] more evident than a play in a relatively uneventful 2-0 victory by Italy over Ghana. An Italian player was fouled from behind by a Ghana player and by the look of it, someone had shot him in the achilles. He laid on the field moaning like someone killed his dog and then stopped briefly to open his eyes to see if he got the foul, then immediately closed them again and resumed moaning. After a few moments, the Docs came on the field and carried him off on a stretcher. About a minute goes by and he's jogging back on the field and proceeds to play at full speed. It was the worst faking since Ricky Williams told us he loved the game of football / since Stu Scott pretended he was street / since Jeff Garcia dated the playboy model... hell, just insert your own joke here."
Americans may generally be arrogant, but there is one stance I stand behind, and that is the intense loathing of penalty-fakers. There are few examples of American sports where diving is part of the game
Diving happens in basketball all the time, but not to the level in Soccer. Maradona actually bragged that he was best diver ever.