The United Kingdom is one of America’s closest allies. The nations have together fought multiple wars, and remain closely tied commercially, politically, and militarily. Yet a 2006 National Geographic survey of young [American] adults found that only one in three could find the United Kingdom on a map.
From The Atlantic.
The same source claims that a 1999 Gallup poll revealed that 20 percent of Americans think that the sun revolves around the earth.