Quite so. JD Vance has shown himself to be at least as xenophobic as Trump, and while one might say it's the job of the VP to help sell the President's ideas it's very obvious that these two individuals are just the incumbent leaders of a much larger American political movement oriented around international isolation and zero-sum transactionalism. The gradual erosion of American supremacy as a safe default assumption in almost every field has led to an intellectual retreat into a geographic fortress mentality which helps to explain the verbal and economic aggression toward Canada and Mexico. It's like a Civ/HOI player cashing in all diplomatic and economic chips in favor of full military mobilization.

The whole Pax Americana/Invisible Empire concept is dead now. Competitive great powers feel liberated from it and erstwhile allies are just never going to believe it again.