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The story said this was something the whole world needed to know, so presumably a specific terrorist act would not qualify--unless somehow the Muzzies had managed to keep it secret.

The visitor also hinted that while two of the grandchildren had died abroad that he was from "surprisingly near".

As one who has read too many post-apocolyptic SF novels I can tell you that many of them show a future America living in underground tunnels.

Presumably that would be necessary in a hundred year war with no victory for either side where both sides had nuclear weapons and were prepared to use them.

So my take is that the visitor lives in those tunnels--that fits with the description of his clothing at the beginning of the story. In such a total war everyone is part of the war effort (like WWII) and there are only two endings possible--total victory or total surrender.

My second choice for "the three words", btw, is "The Fourth Reich".