„During March and April 1959, at Wheeler's request, Everett visited Copenhagen, on vacation with his wife and baby daughter, in order to meet with Niels Bohr, the "father of the Copenhagen interpretation of quantum mechanics". The visit was a complete disaster; Everett was unable to communicate the main idea that the universe is describable, in theory, by an objectively existing universal wave function (which does not "collapse"); this was simply heresy to Bohr and the others at Copenhagen. The conceptual gulf between their positions was too wide to allow any meeting of minds; Léon Rosenfeld, one of Bohr's devotees, talking about Everett's visit, described Everett as being "undescribably [sic] stupid and could not understand the simplest things in quantum mechanics". “ Source and original source here: https://en.wikipedia.org/wiki/Many-worlds_interpretation

Everett spent 4 years doing graduate studies, taking his first physics courses then and coming up with his many-worlds dissertation within a single year (137 pages ’typed’ (according to current historical records) by his later wife Nancy Gordon). He pretty much left physics afterwards, for doing weapons research(!) for the Pentagon.

Many-worlds sounds like what an overconfident ‚pragmatic’ college graduate would come up with even to those who don’t do physics.

Is it just my impression or is it mostly US-Americans who are pushing many worlds into physics?