Apparently, over a quarter of Americans don't know from whom we declared independence in 1776. Gee, even if Americans got their history from Bugs Bunny they should know that. (Sorry about the commercials in the link). And there's always School House Rock.
On a related topic, President Coolidge's speech in honor of the one hundred fiftieth aniversary of the approval of the Declaration of Independence always bears rereading. Too bad it's seldom taught in our schools.