In 1962, on the 9th of July, the US government tested a hydrogen bomb high above our atmosphere. 248 miles above Earth's surface, in fact. Starfish Prime, as it was known, was aimed at answering a few questions about the newly discovered Van Allen belts - trajectories of high energy charged particles that whip around our planet's magnetic field (it is at the poles, where the magnetic field concentrates charged particles from the solar wind, that we get the Aurora phenomena) - among other things. This test was one in a multitude of test explosions, above, on, and even below Earth's surface, conducted by both ourselves and the Russians - but this test was different. It changed things.
The 1.4 megaton explosion created an artificial expansion of the Van Allen belts, creating bands of charged particles, simultaneously glowing red, green (both oxygen) and blue (nitrogen) in the upper atmosphere. Across the Pacific (for hundreds of miles), a surreal light show (similar to the Aurora) graced the skies. It lasted nearly seven minutes. The resultant EMP knocked out electrical systems as far away as Oahu (roughly 800 miles distant). And yet people crowded onto rooftops, decks and verandas to see the spectacle. (All through the Cold War, in fact, people would travel to test sites to witness nuclear blasts; Las Vegas cashed in on much of the "atomic tourism" by designing specific packages to cater for those wishing to view tests at the Nevada test site.)
So this Fourth of July, when you sit in the park watching all of those rainbow-colored chemical explosions a few hundred feet above your head, remember the nuclear explosions conducted decades ago a hundred miles above your head. Celebrating our country's independence is no longer merely a matter of one small piece of history - it should be a memorial of all pieces of our country's history, the triumphant, the humbling, the dirty and the heroic. We didn't invent fireworks - the ancient Chinese did that - but we did invent the nuclear bomb.