European fealty to the US has existed for decades.
True, but it was, until 2008, a somewhat less lopsided relationship.
Europe is becoming a museum and a retirement home. Young people leave to make their fortune and maybe return to have a family or avail of healthcare. And while I have nothing against old people my own street in a _very_ family-oriented suburb in the Netherlands is over 50% retirees.
Though I see the flow of migrants between the US and Europe has shifted, so there's a net gain of Americans in Europe. I wonder if it's where young people with dreams want to go, or if it's just where people like my in-laws (nice, culturally aware, but no longer very economically productive) who have a few million dollars in their 40's and want a pretty place to retire young, go.
I think you’ll find that it was mutually beneficial deal that traded soft-power for preferential agreements. As it started to crumble, we’ve begun diversifying and directed our schmoozing to better partners.
Since the US entered WW2
Number one issue of our times. I'm eternally frustrated discussion of this basic fact of our political lives is near zero in public discourse.