What sign was shown just behind George W. Bush as he is first being informed that America was under attack on 9/11 ?

Well, it was a more politically correct one than the logo on my favourite T shirt dogspit, which says "Would it kill you to read a ******* book?"

George's sign said, " Reading makes a country great"
Then they told George about the attack, and he carried on listening to the second graders reading stories.

You got it !

Thanks for the answer dance girl !