BTW, illegal immigration (barbarian invasion) could very well become that Question.
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That is the existential threat to the continuance of the Republic as founded.
Then we’re screwed.
At least ten percent of our population consists of illegal immigrants, their anchor babies, and their sympathizers.
Add to that the ‘refugees’ we have been admitting from $#!+hole countries.
We’d have an internal war the likes of which we have never seen anywhere.