I'd hate to be the devil's advocate, but I think that most of the public wouldn't even know, nor care, about most of the "icons" of america's history.
Not to mention the usual opposition to old-fashioned flag waving patriotism because Hollywood money men fear it will turn off foreign filmgoers. Let's not forget that most of Hollywood's profits are now made outside the United States, many movies only turn a profit when they are released overseas.
Maybe it's just human nature, but I doubt that the Chinese and Europeans will pay money to see americans cheer the Stars and Stripes and brag about the greatness of any of the mentioned historical characters.
(Unless, of course, the film features stars like Clooney, Sheryl Crow, Mike Farrell, Ed Harris, Jessica Lange, Madonna, Sean Penn, Tim Robbins, Susan Sarandon, Martin Sheen, Oliver Stone, or Barbra Streisand, and is directed by Michael Moore.)