Star Trek Episodes for the American 4th of July Holiday

I'd like to make a list of Star Trek episodes that are great to watch on the 4th of July Holiday. Oddly enough, a list does not already exist. So...I asl all of you to help me!

List episodes you think would fit well in a 4th of July Star Trek marathon, and why you think so!

I start, of course, with the Star Trek Original Series Episode "The Omega Glory." This episide is very CLASSIC American freedom themed - with the "Yangs" and the "Kohms" (aka the Yankees and the Communists). Complete with a awesome speech about freedom and the American Constitution...this episode is a MUST watch on a freedom-themed holiday weekend.