The world has changed and Trumps actions recognise that. The US under Trump is moving from being the security guarantor of western nations and their allies Japan and S.Korea, to retrenching to a regional hegemony where the Americas are its primary focus. Europe is being told fend for itself. Australia is hearing the same message. Taiwan is clearly not secure or seen as a vital priority by the US. S.E..Asia is already increasingly under Chinese influence with Myanmar Laos and Cambodia all now tribute states to China.

Oil exporters long accepted the petrodollar regime upon which US monetary hegemony now is based. But now there is an alternative- Iran and Russia now process payment for their oil and gas exports via Chinas shadow banking system. Despite being excluded from USD/SWIFT Iran and Russia have maintained their exports and military capability. China can and does now provide a full service alternative to US hegemony in trade and trade payments. Fossil fuel exports are no longer tied to the USD.

China, Russia and Iran are directly and by proxy challenging US hegemony. Increasingly trade in goods is dominated by China and increasingly that trade is denominated in Yuan. If trade payments are no longer mostly made in USD the security and value of the USD rapidly declines- Trumps actions accelerate the decline of status and security of the USD.

He is dismantling the global hegemony the hegemony of the USD was based upon because it is no longer sustainable and viable. Trump can see and accept that the USA is no longer viable as a globally dominant power.

Monetary hegemony has always been based upon trade dominance and the wealth and military capacity trade dominance both necessitates and enables, and USA is no longer dominant in global trade and its military dominance is in rapid decline.

Only diehard US exceptionalists blinded by Trumps 'Make America Great Again' rhetorical irony cannot see the reality of what is unfolding.