Surprisingly, given how directly he dealt with other holidays, Charles Schulz did few Fourth of July strips, and no TV specials. Perhaps his own sense of patriotism was the cause. Here's a telling letter he sent in 1970.
Happy Fourth of July, everybody! This is always a great day in the Obama family: a chance to celebrate America—and Malia’s birthday, too. Hope all of you are able to get some time with friends, family, and fireworks.