Independence Day is no longer a celebration of America's independence from Great Britain. Rather, it's an organized holiday where our father's drink heavily at barbeques and chase their children around with roman candles.
I don't have many country-specific facts, rather a few state-specific ones;
Massachusetts and Maine are the only two states that celebrate Patriots' Day, commemorating the anniversary of the battle of Lexington and Concord during the American Revolutionary War. It's considered a "civic holiday" where most businesses close, so their employees can watch parades for the hundredth time.
Contrary to popular belief, due to the depiction of us in the influx of Boston-based movies, not every Bostonian has a thick Boston accent. We don't all "pahk the cah in the Hahvahd Yahd."
Charlestown is not the bank robbery capital of the United States. Sorry, Ben Affleck.