http://www.nationalgeographic.com/geosurvey/download/RoperSurvey.pdf

"Overall, knowledge of geography among young adults in the U.S. continues to trail that of young adults in most other countries surveyed, and there is little to no improvement since the 1988 survey."

"A majority of young Americans grossly overstated the U.S. population.... (30%) said that the U.S. has 1 to 2 billion people, or roughly one-third of the world s population"