When referring to "American" Jackie Chan films, those are the ones with an American production, as opposed to a Hong Kong production. Rumble In The Bronx was essentially an HK movie. But whatever, I thought that Rush Hour 1 and 2 were good, as was Shanghai Noon (haven't seen Knights yet), although all of his U.S. made movies terribly under-utilize his martial arts skills. My favorites are Operation Condor, Legend Of Drunken Master (DM 2), and the Police Story series. Supercop was pretty good, too.