What is the 4th of July All About?

Did you know that 65% of fourth graders have no idea why we celebrate the 4th of July. When asked by a polling organization they gave answers like:

1. We have fireworks or go to fireworks.
2. We have picnics and friends or family visit.
3. Mom and Dad don't have to go to work.

All of these things are true, so they were accurate as far as they knew.

So if July 4th isn't about these things, what is it all about?