Judging from the President's remarks, you'd never guess that one of the very first wars fought in this country was against North African Muslim nations that were capturing our merchant ships and selling Americans into slavery!
Since grade school, Americans have been endlessly indoctrinated and shamed by the evil of enslaving Africans (and rightly so!), but we never hear about the fact that African Muslims were enslaving Americans! My guess is that the vast majority of Americans--possibly even including our President--don't have a clue.
(hat tip: Professor ed)