I think you might want to rethink that assumption. No definitive data, to be fair, but this:
http://www.cnn.com/2006/EDUCATION/05/02/geog.test/"Inside the United States, "half or fewer of young men and women 18-24 can identify the states of New York or Ohio on a map [50 percent and 43 percent, respectively]," the study said."
I don't think it's that far fetched.
