Independence Day: A Feast Day (?)

I had the 5:30 Wednesday service yesterday. To mix it up a little bit, I normally transfer a feast day from another week day. It gives people to hear about people from our past (at least that's my reasoning). The only feast day this week was (cue dramatic music) Independence Day.

As I started thinking about the service at, oh, 5:15, I didn't have any clue what to say. I ended up being very grateful I was not better prepared, because, instead of me yacking, those gathered ended up having a great discussion about why Independence Day is (or should not be) a feast day. Some thought it didn't belong at all, because July 4 is a secular holiday. Someone pointed out the Declaration of Independence's endowed by their Creator with certain inalienable rights passage calls us to observe it (Ironically, of course, this language was juxtaposed with the worst example of racial slavery in the history of the world). Someone else conjectured that since some of the Founding Fathers were Episcopalian, maybe they influenced the inclusion of the day in the Book of Common Prayer.

So, what do you think? Why is Independence Day a feast day, albeit a lesser one, in the Episcopal Church? Should it be?