[nostrademons]

It's interesting to contrast the response of American leaders to the Great Depression and run-up to WW2 ("The only thing we have to fear is fear itself") vs. that of 9/11 ("See something, say something").

[schoen]

Also, as people have been pointing out, "Keep calm and carry on" (on the other side of the Atlantic).

https://en.wikipedia.org/wiki/Keep_Calm_and_Carry_On

(On the other hand, there were a lot of wartime counterintelligence efforts in the U.S. and U.K. which I think must have included public calls for people to turn in suspected Axis spies.)

[blatherard]

As a counterpoint: internment of Japanese Americans.