I feel the Beatles wild success in the United States is linked to the incredible sadness in the U.S. after the assassination of John F. Kennedy. These four English lads were the Pollyannas that the country needed, clung to, to get out of their national funk.
The British musicians—who weren't as queasy about it—took R&B, Rock and Blues and played it back to the Americans from a safe distance.
https://daytrippin.com/2018/10/08/john-lennons-lifelong-obse...
(interesting find prompted by other, also interesting, answer)
That's a bit of what the movie Hairspray was about. The pause, that is.
edit: honestly, rock and roll probably would have died then if it weren't for the British Invastion. The kids were getting into folk.