If you check I think you'll find it began in the 1940s when FDR openly mused about a world with Europe made irrelevant while the USA reigned predominant. since then it has been codified more than once, I suppose I could dig up references... but so could you if you look.
"... They ne'er cared for us
yet: suffer us to famish, and their store-houses
crammed with grain; make edicts for usury, to
support usurers; repeal daily any wholesome act
established against the rich, and provide more
piercing statutes daily, to chain up and restrain
the poor. If the wars eat us not up, they will; and
there's all the love they bear us."
-- Shakespeare: Coriolanus, Act 1, scene 1