The idea of sending books that are deeply close to American history seems like an obviously terrible idea. Yeah no shit that wasn't going to resonate with an Iraqi child. A lot of these books are culturally foreign to American kids.
Great books are often cross-cultural. We Russian kids enjoyed Tom Sawyer very much. “It”s not every day that a boy gets a chance to paint a fence”… There was (and is) a lot of buzz in Russian culture about Moby Dick though I personally failed to enjoy it. Never heard of Of Mice and Men though - probably because our communists were rather puritanic.
I think problem was that planting a book-reading habits require a lot more work than providing books.