In order to become citizens, immigrants must pass a test. Toast.net has an Independence Day Quiz at http://games.toast.net/independence/ that gives you a chance to take a sampling of questions on the new citizenship exam.
You must answer 24 of the 30 questions correctly to pass. In fact, 96% of U.S. high school seniors failed, as did 50% of those over 50 years old. I got all 30 right, but I owe some of that to superior guesswork.
I did not guess so well on the President's Day Quiz, http://games.toast.net/presidents/ -- only 13 right.