When economists search to account for the greenback’s outsize position as the one true world foreign money, they level to structural components such because the US share of world GDP, or the depth and liquidity of US monetary markets. This method underlies the sanguine view of many monetary market contributors that, come what could, as long as the US stays the world’s main financial system, the greenback will stay its protected haven.
The second Trump administration is a reminder that uncooked numbers can solely take us up to now. For as historians will let you know, it’s the actions of individuals, not economies or markets within the summary, that designate how worldwide currencies rise and fall. It was individuals who took the essential steps to construct the establishments that made the worldwide greenback. And it’s individuals who will finally decide whether or not these identical establishments survive or fail.

The person with the strongest declare to patrimony of the worldwide greenback might be Paul Warburg, German-American scion of the Hamburg-based Warburg banking household. The younger Warburg labored in worldwide finance in Hamburg, Paris and London earlier than marrying into the Kuhn, Loeb banking dynasty in 1895 and emigrating to the US in 1902. Intensive worldwide expertise impressed upon Warburg the benefits accruing to Britain from London’s place because the main supply of commerce credit score and funding finance for retailers and bankers in various components of the world. These various components included the US, which was virtually totally depending on London and sterling for worldwide credit score.
Like many a naturalised citizen, Warburg was deeply loyal to his new nation. He nervous that the American financial system’s dependence on London and sterling uncovered it to overseas shocks over which it had no management. He appreciated additionally that London’s enchantment as a global monetary centre rested on the backstopping efforts of the Financial institution of England, which stood able to act as lender of final resort, guaranteeing the market’s liquidity and stability. It adopted that any aspirations the US may need needed to promote worldwide use of the greenback had been hamstrung by the absence of a central financial institution.
Concerning the paintings
The pictures of the US foreign money on this article are from Floyd Douglas’s ‘Golden Greenback’ sequence, through which the Dutch artist makes a tongue-in-cheek commentary on shopper tradition with acrylic sculptures of gilded $1 payments
Beginning in 1906, Warburg grew to become a tireless promoter of the creation of this establishment. One of many potential central financial institution’s key features, he argued, could be to develop a market in dollar-denominated credit score devices to be used in financing worldwide commerce. Adopting European parlance, he referred to those financial institution drafts or payments of trade as commerce acceptances, anticipating that the central financial institution would “settle for” or purchase them as a method of lubricating the brand new market in commerce credit score.
Warburg wrote newspaper columns. He spoke at public boards, overcoming shyness born of closely accented English. In 1910 he was a part of the small group of specialists who met on Jekyll Island, off the Georgia coast, to thrash out the provisions of what grew to become the Federal Reserve Act. In 1914 he grew to become a founding member of the Federal Reserve Board. The laws he drafted allowed the Fed to buy greenback commerce acceptances as a method of fostering the market. By the Nineteen Twenties, that market had grown to the purpose the place the worth of greenback commerce acceptances matched, and in some years exceeded, the worth of commerce credit originated in London and denominated in sterling.
The greenback’s standing as a rival to sterling suffered a setback within the Nineteen Thirties, when the Fed withdrew from the acceptance market and the US suffered a sequence of debilitating banking and monetary crises. America emerged from the second world conflict because the western world’s solely superpower, creating a gap for the greenback. Nevertheless it took the intervention of one other singular particular person, Harry Dexter White, to cement the buck’s worldwide position.


White got here from extra modest origins than Warburg. His dad and mom had been Lithuanian immigrants, his father a peddler who went on to open a ironmongery store. A prickly persona, White pursued an unrewarding educational profession earlier than becoming a member of Henry Morgenthau’s Treasury Division in 1934 and rising to assistant to the secretary with full accountability for Treasury’s participation in all worldwide financial and monetary issues associated to the second world conflict. Through the conflict, White drafted the plan that grew to become, with modifications, the US blueprint for the IMF, the World Financial institution and the Bretton Woods System, the establishments that supplied the premise for the postwar worldwide financial order and the dominance of the greenback.
To make certain, the US needed to negotiate with different nations current on the worldwide financial convention convened at Bretton Woods, New Hampshire, in 1944. White needed to parry along with his British interlocutor, John Maynard Keynes. However key parts of the White Plan went straight into the Bretton Woods settlement.
Particularly, White sought to tell apart the greenback as the one totally convertible worldwide foreign money of the newly minted Bretton Woods System. An early draft of the settlement learn that trade charges ought to be pegged to gold or “gold-convertible currencies”. When considered one of Keynes’s colleagues, Dennis Robertson, innocently noticed that solely the greenback was apt to be freely convertible into gold following the conflict, White noticed a chance to cement the greenback’s position. He and his workforce stayed up all evening, redrafting the settlement to switch “gold-convertible currencies” with “gold . . . or the US greenback of the load and fineness in impact on July 1, 1944”. The Bretton Woods settlement thus singled out the greenback because the solar round which the opposite parts of the postwar worldwide financial system revolved.
The next interval of greenback dominance was not attributable solely to White and the establishments created at Bretton Woods. It took the Marshall Plan to offer Europe with the {dollars} wanted to renew worldwide funds and reintegrate its economies into the worldwide order. US leaders needed to bypass Congress’s reluctance to affix the Worldwide Commerce Group by agreeing to ascertain the Common Settlement on Tariffs and Commerce.

The US supported European integration and creation of the European Financial Neighborhood, a place that reassured European policymakers of the knowledge of counting on the foreign money of a steadfast alliance companion. Nato confirmed the Europeans that they’d not simply an financial companion but in addition a geopolitical companion on whose commitments — and foreign money — they may safely rely. Sturdy US development advised them that America might stand behind its obligations.
Thus, even when the Bretton Woods System of trade charges pegged to the greenback broke down in 1971, the buck’s world centrality lived on, supported by the establishments constructed by Warburg, White and their compatriots: an impartial Federal Reserve, an open world buying and selling system to which the US and its companions had been dedicated, and a rock-solid geopolitical alliance. The greenback’s continued dominance derived from sheer numbers — from the US’s massive share of worldwide GDP and monetary transactions — however equally from relationships and reciprocity.

It has taken Donald Trump only some months to weaken if not destroy these relationships and that reciprocity. Trump and his appointees query the very values and preparations on which almost a century of greenback dominance is predicated. For the primary time in dwelling reminiscence, the survival of the establishments on which that dominance rests has been solid into doubt.
To begin, America’s financial exceptionalism is doubtful. The US financial system has outperformed these of different superior nations lately. It’s house to the world’s main tech corporations. It’s on the forefront of analysis in synthetic intelligence. It has a start-up-friendly tradition the place serial entrepreneurs are forgiven their failures, and a well-developed enterprise capital trade to seed new enterprises. It’s a magnet for overseas expertise.
However there is no such thing as a assure that what was true up to now will probably be true sooner or later. The analysis capability of the general public sector and US universities is being gutted. Whether or not expert migrants will nonetheless see America’s pearly gates as welcoming is an open query. Coverage uncertainty and doubts about rule of regulation threaten to make America a much less engaging place to take a position.

The US share of worldwide exports has fallen considerably for the reason that early Nineteen Fifties, from 18 per cent to only 11 per cent. There’s nothing unhealthy about this development in and of itself. It displays profitable post-second world conflict reconstruction of the worldwide financial system, a course of through which America had a substantial hand. However an additional decline within the US share of worldwide commerce, engineered by skyscraper tariffs imposed by politicians satisfied that worldwide commerce is a zero-sum sport, could be decidedly unhealthy. Historical past is replete with examples of how a rustic’s business hyperlinks assist worldwide use of its foreign money — and the way disruption of these hyperlinks undermines a foreign money’s worldwide standing.
It’s simple to see why. The foreign money of the main buying and selling nation is a pure habitat for its exporters and importers, who loom massive in world markets. There’s then an incentive for exporters and importers elsewhere, when in search of to do enterprise with this main financial system, to equally utilise its foreign money, given its comfort for his or her prospects and suppliers. The inducement is comparable for overseas entities in search of to borrow on this dominant nation’s monetary markets. Consequently, when the load of an financial system in world commerce and finance declines, the market forces making for widespread use of its foreign money have a corresponding tendency to weaken. A perverse “America First” tariff coverage damaging of US commerce would speed up this course of.
As well as, there’s a hazard to the greenback from haphazard US use of sanctions. Even earlier than Russia’s assault on Ukraine and sanctions on Russian entities, America had more and more turned to this monetary weapon: the variety of people topic to US sanctions had risen from 912 in 2000 to greater than 9,400 in 2021. Sanctions imposed on Russia in 2022 sharpened the motivation for nations to hedge their bets by diversifying away from the greenback, given the chance that Russia’s greenback belongings may not solely be frozen but in addition garnished and repurposed for Ukrainian reconstruction, setting a precedent for what different nations might endure.
Importantly, nevertheless, these sanctions had been imposed in co-operation with America’s allies, leaving the Russian authorities few options to the greenback to be used in worldwide funds. However right here too, previous will not be prologue. European nations weren’t on board with the primary Trump administration’s coverage of “most strain” on Iran and its reimposition of sanctions in opposition to the nation.

The decline of transatlantic co-operation in Trump’s second time period factors to the excessive chance of extra such disagreements. Trump has not precisely been cautious in threatening to unleash financial weapons, be they tariffs, sanctions or different measures. When making use of them, he has not co-operated with different nations — fairly the opposite. If the US continues to go its personal method, then the currencies of different nations, these that don’t take part in US sanctioning efforts, would be the beneficiaries of diversification away from the greenback.

Then there may be America’s troubled fiscal and monetary outlook. The greenback has been engaging to central banks as a type of overseas reserves, and to company treasurers, sovereign wealth fund managers and worldwide buyers typically, as a result of it’s out there in ample quantities whereas nonetheless holding its worth. The US has supplied a gradual provide of {dollars} to satisfy the liquidity wants of an increasing world financial system with out supplying so many as to erode confidence of their worth.
But when this has been true till now, US fiscal and monetary woes might, within the not-too-distant future, push the greenback over the sting. The Congressional Price range Workplace’s long-term price range outlook reveals debt within the palms of the general public rising from 99 per cent of GDP in 2024 to 116 per cent in 2034, 139 per cent in 2044 and 166 per cent in 2054. Impending laws, together with measures that stretch Trump’s expiring 2017 tax cuts, might push debt up even quicker. There isn’t any magic debt-to-GDP threshold the place confidence is mechanically misplaced. However countless tax cuts, legendary expenditure reductions and excessive ranges of political polarisation will in some unspecified time in the future trigger overseas buyers to doubt the greenback’s prospects.
If {dollars} are a horny retailer of worth and technique of cost as a result of they’re anticipated to carry their worth, then steps by the Trump administration to undermine the independence of the Federal Reserve would significantly harm the buck’s sights. In February, Trump signed an govt order asserting that “officers who wield huge govt energy have to be supervised and managed by the folks’s elected president”. He instructed all “so-called ‘impartial regulatory businesses’” to submit their regulatory proposals for evaluate by the White Home previous to enactment. His appearing solicitor-general, Sarah Harris, asserted to the Senate that the Division of Justice would now not defend provisions requiring the president to quote “trigger” when dismissing an impartial company head.
It’s unclear whether or not such orders will finally be invoked to problem the independence of the Fed or the safety of Jay Powell’s appointment as chair. However Trump has simply fired the 2 Democrat members of the impartial Federal Commerce Fee. Overseas buyers will draw their very own conclusions.
There are questions, furthermore, about whether or not overseas holders of US debt securities will proceed to be handled pretty. Scott Bessent, Trump’s Treasury secretary, has reportedly mulled the potential of changing five- and 10-year US treasury bonds held by overseas buyers into 100-year securities bearing low rates of interest, whether or not these buyers prefer it or not. Through the 2024 presidential marketing campaign, advisers to Trump resembling Robert Lighthizer mooted the potential of taxing overseas purchases of US treasuries as a method of driving down the greenback and enhancing the competitiveness of US exports.
Trump’s nominee to go his Council of Financial Advisers, Stephen Miran, in his earlier incarnation as funding strategist, endorsed such a coverage and described the way it is likely to be applied. Miran proposed slapping a “person charge” on overseas official holders of treasury securities by withholding a portion of their curiosity funds. Labelling the measure a person charge as a substitute of a withholding tax would keep away from violating worldwide tax treaties. However it could fall foul of the expectation that home and overseas buyers are to be handled comparably, an expectation that could be a basis stone of the greenback’s worldwide standing. This effort to restrict overseas purchases of US treasuries as a method of depreciating the greenback, one thing that Trump and his advisers evidently see as fascinating, might shortly get out of hand.


Lastly, the greenback’s world position will endure if the US is perceived as turning its again on its allies. Nations maintain as reserves and use in worldwide funds the currencies of their alliance companions. Not solely are these companions seen as dependable stewards of their overseas balances, however holding the foreign money of 1’s ally is taken by the companion as an indication of fine religion. Earlier than the primary world conflict, members of the Triple Alliance (Germany, Austria-Hungary and Italy) and the Triple Entente (France, Britain and Russia) held as overseas reserves the currencies of their alliance companions. Nonetheless different nations held as reserves the currencies of nations with which they’d safety understandings.
Within the Nineteen Thirties, not solely the Commonwealth and Empire but in addition a good variety of Britain’s different allies held their reserves in London and pegged their trade charges to the pound within the association often called the Sterling Space. Within the Sixties, the German and Japanese governments supported the greenback, serving to to protect its worldwide foreign money standing, due to the worth they connected to their defence alliance with the US, and particularly to US army forces stationed on their shores. At the moment, Taiwan, South Korea and Japan maintain a disproportionate share of their overseas reserves in {dollars} as a result of they rely upon the US safety umbrella. Within the wake of Trump’s Oval Workplace blow-up with Volodymyr Zelenskyy and appeasement of Russia, this notion that alliance politics are vital for worldwide foreign money standing is about to obtain a real-time take a look at.
Finally, the destiny of the greenback will activate the willingness of America’s leaders to uphold the rule of regulation, respect the separation of powers and honour the nation’s commitments to its overseas companions. It’s going to rely upon the readiness of Congress, the courts and the general public to carry their ft to the fireplace. Who would have thought it could come to this?
Barry Eichengreen is professor of economics and political science on the College of California, Berkeley and creator of ‘Exorbitant Privilege: The Rise and Fall of the Greenback’
Discover out about our newest tales first — observe FT Weekend on Instagram and X, and sign up to obtain the FT Weekend e-newsletter each Saturday morning