There should be figures on literacy rates all across the U.S. to reference. After talking to a friend who has done extensive business travel to areas in the U.S. (Alabama, North Dakota, Georgia, etc) my opinion is that the problem in some of these areas is the same as those in primarily African-American ghettos in the North; Poverty. Now, what has KEPT these areas in poverty all these years is debatable, but it's clear that if the intelligence exists in a group, they eventually work their way out of poverty, as many immigrant groups to the U.S. have done for the past 200 years. One thing is guaranteed, however; Sitting around, lamenting your lot in life and worshipping ignorance is no way to better yourself.
-Rich