Robert Hardman explained how Elizabeth was winning over American hearts from childhood, starting with her very first radio broadcast on October 13, 1940.
Hardman told co-host and historian Kate Williams that coverage of the visit was 'unfair' - although he acknowledged it 'wasn't easy' for the Prince and Princess.
Hardman however warned that monarchs often benefit from having a controversial sibling who can take the flak and deflect attention from the heir to the throne.
Hardman claimed Britain's longest-serving monarch always held 'great sympathy' for the awkward position of those who grow up in the shadow of the future monarch.
Hardman discussed the validity of the story alongside his Queens, Kings and Dastardly Things co-host Kate Williams, on a podcast exploring the monarchy's belief in the supernatural.
Health problems, scandals, conspiracy theories and financial questions have plagued the Royal Family this year, though there have been joyous moments too.