(By the way, please don't steal any of these photos.)
For those of you who aren't necessarily familiar with every custom and holiday in the USA... on July 4, 1776, a bunch of guys in wigs got together and said, "Hey! We are sick and tired of being colonies! We are sick and tired of doing what England tells us to do! We're not gonna take it any more!" So on that day, they put their signatures on the Declaration of Independence, which eventually led to the USA being its own country. ...that's my interpretation, anyway.
To celebrate this, Americans traditionally set off lots of fireworks. Here's what Wikipedia has to say on the matter.
Now, if you're not willing to sit around for 6 hours in advance to reserve a good "front-row" seat, you need to be willing to watch the fireworks over trees and power lines. (There are a lot of trees around here.) Which is okay by me.