It seems that if you plot the belief in evolution versus national wealth, the United States of America is an outlier – by a long shot.  The graph shows the % of adults that answered “true” to the statement, “Human beings, as we know them, developed from earlier species of animals.” (Jon Miller et al, Science, Aug 2006).  Data for GDP per capita was adjusted for power parity and was taken from the CIA World Factbook.

Click on the graph to see a larger, more legible version.

Source: http://www.calamitiesofnature.com/archive/?c=559