>>>I think America was at her peak in 1963
I think a better argument can be made that the turning point was 1960, when an alliance of big city bosses and the Cosa Nostra stole a presidential election putting in place a weak and inexperienced man as president.
When glamor in a politician became more important then competency or integrity. When the Monroe Doctrine still held sway and had not yet been abandoned as the price of de-escalating a nuclear crisis initiated by Soviet leaders relying on the failure of American presidential leadership. And when family dynasties were not the defining characteristic of US presidential politics.
Kennedy was already too busy with his own "twist" on what was meant by the Monroe Doctrine.
(BTW twist is just "lisp-synch" for "tryst")