Have Your Say: Make America's Greatest Film Known Again!

Truth be told I was tempted to have today's "Opinion Subject of the Week" be about the U.S. elections, but that idea had one problem: I kinda used it already a mere three months ago.
Given the fragile nature of democracies, I could do one on dystopias in film, but... ahem, that's a bit too close to the one we all did last week.

What to do, what to do? Well, one recurrent theme in this year's election is the presumed greatness of the United States of America. One side says the country is indeed great, and on the road to becoming even greater. The other side says the U.S.A. was once great, but is currently a disgrace, though it can be made great again.

So we have America (or rather the part of it which resides between Mexico and Canada), and greatness past and/or present. Which makes me think of a multitude of great, great films over the years, decades, for more than a century even.

And THAT made me settle on the question of today: what is the greatest (U.S.) American film ever made?
Chime in and vote, in the comments below, and HAVE YOUR SAY!

Oh, and if you're allowed to vote in the U.S. elections, vote for that as well. Seriously, folks, voting is important, and I'm saying that as a non-American. Peace be with you all!