IMO, only 10% of the population would pass. We all seem to be pretty knowledgeable about U.S. History so I think from our pool of people, we will be a little better than average.
Anyways, here it goes:
0-20%: Maybe you're still thinking too much about the Old Country.
25-40%: Mmmm. Do you really want to be a citizen? This kind of performance isn't going to impress those nice immigration folks.
45-60%: Not too bad, but you really need to break out the civics books again -- word is, the INS is looking for an 80 percent score.
65-80%: Hey, you may make a good citizen yet! Look at your wrong answers and a little revision should do the trick.
85-100%: Welcome to the United States! (And, truth be told, you know more about this great land than most Americans.)
My Score: 85%
http://www.msnbc.msn.com/id/25461301/?GT1=43001