Look up results of international polls,such as Sight and Sound,(each decade 1952-1992,another due this year),FIAF centenary list,etc.Many can be found on TOP 100 Movie Lists website.
The top American films in certain polls:
Russia,1995;Citizen Kane,Intolerance(the only 2 in the top 10 overall).
Romania,1995;Citizen Kane,The Gold Rush,The General,Greed,Sunrise,Casablanca(the only 5 in the top 30)
Germany,1995;The Searchers,Taxi Driver,Vertigo,Citizen Kane,North by North West,To Be or Not to Be(all in the top 10)
Sight and Sound,1992;Citizen Kane,Vertigo,Raging Bull,The Searchers,2001:A Space Odyssey,Singin in the Rain,The Godfather/Godfather2,Modern Times,City Lights,The General,Sunrise(in the top 20 overall,adding votes of critics and directors).
So,quite a few older classics and silents.For a very different list,see the recent Channel 4(Britain)poll of viewers ,which gave itself the most inappropriate title,The 100 Greatest Films.This has more than enough American films included, reflecting public taste.