With a few minor changes a notice like this one could have been used any time in the last few decades, don’t you think? Just insert Koreans, Cambodians, Lebanese, Nicaraguans, Vietnamese, Bosnians, Somalis, or Iraqis in the right spots and you’re good to go.
In fact, I was thinking of making a Mad Libs version. It would come in pads of fifty sheets and the names of the countries would be left blank — except for one. That country would be the same on every page.