Quora Answer: If Trade with the Countries the US Relies on Stopped, What Would be the Consequences?

The following is my answer to a Quora question: “Could the United States economy handle a sudden stop in trade with countries it heavily relies on, and what would be the broader economic consequences?”

Obviously, no.  The United States economy cannot handle this.  Not gracefully, not quickly, and not without consequences reaching well beyond a single trade dispute.

The Lights Could Go Out

The United States imports 92 per cent of the potash it consumes, according to the United States Geological Survey’s 2026 Mineral Commodity Summaries.  Domestic production covers 400,000 metric tons against national consumption of 5.9 million.  Canada supplies 79 to 90 per cent of that shortfall, depending on the measure used.  Potash has no ready substitute in fertiliser formulation, and America’s own farmland cannot function without it.  The United States imports 60 per cent of its aluminium, mostly from Canada.  57 per cent of America’s copper, essential for electrification and grid infrastructure, is imported, led by Chile.  China accounts for 90 per cent of rare earth processing.

This is not a diversified supply chain with a spare option waiting in reserve.  It is a stack of single points of failure: energy, fertiliser, industrial metals, rare earths – each concentrated in one or two foreign suppliers, each feeding directly into the power grid, the food supply, and the manufacturing base simultaneously.  Cut any one of them off suddenly, and the disruption does not stay contained to that one input.  It cascades through everything downstream of it.

Current Policy is Pushing Partners toward Alternatives

Canadian aluminium exports to the United States fell by half between July 2025 and July 2026 as tariffs bit, according to Bank of Canada figures.  Canadian producers have argued American manufacturers, not Canadian exporters, are absorbing the real cost, paying US$1,500 to US$2,000 more per tonne than European competitors.  Canadian smelters can redirect shipments toward Europe and Asia instead, and increasingly are.  Washington’s own Section 338 tariffs, a fresh round targeting Canadian goods at 50 per cent from 22^nd August 2026, exempted energy, potash, fish, and critical minerals entirely, a carve-out that reveals which Canadian exports Washington judged too essential to touch even mid-dispute.  The exemption is an admission.  You do not exempt what you can afford to lose.

The United States Cannot be Trusted with Its Own Treaties

The 2019 USMCA deal removed Section 232 steel and aluminium tariffs on Canada and Mexico, with side letters committing Washington not to reimpose them.  That assurance lasted six years.  The scheduled six-year USMCA joint review, held on 1^st July 2026, produced no renewal commitment.  Washington’s own trade representative declared the United States would not renew the pact in its current form, citing persistent trade deficits, sliding the agreement into annual review cycles with its longer-term status unresolved.  Three weeks later came the 50 per cent tariff round described above.

The United States Supreme Court struck down the administration’s own “Liberation Day” tariffs in February 2026 as unconstitutional, and the administration simply reconstructed the same tariff wall using other statutes within weeks.  A trading partner negotiating with a government whose own courts have already ruled its trade policy illegal once this year, and which rebuilt that policy anyway under a different legal label, is not negotiating with a reliable counterparty.  It is negotiating with a government that treats a signed agreement, and a Supreme Court ruling, as opening positions rather than binding commitments.

The Numbers on the Economic Strain

The Tax Foundation estimates the current tariff regime will reduce long-run United States GDP by 0.4 per cent, while raising US$1.4 trillion in federal revenue from 2026 through 2035.  As a share of GDP, the 2026 tariffs increase tax revenue by 0.36 per cent, placing them among the twenty largest tax increases as a share of GDP since 1940.  The burden falls unevenly.  Tax filers in the bottom income quintile lose US$73 a year in after-tax income.  Filers in the top quintile lose US$1,868, a regressive burden once measured against income, since the bottom quintile’s loss consumes a far larger share of a far smaller income.

Foreign direct investment has collapsed rather than surged, despite the administration’s own predictions of a flood of new capital.  Quarterly FDI fell to US$52.8 billion in the first quarter of 2026, the lowest total since the fourth quarter of 2022, well below the ten- and twenty-year quarterly averages.  Total capital investment across FDI projects fell 62 per cent year-on-year in the same quarter, alongside a 17 per cent decline in the number of projects announced.  Excluding a single US$14.2 billion acquisition, Nippon Steel’s purchase of US Steel, FDI into metal product manufacturing would have declined by 60 per cent on its own.

The pre-tariff United States trade deficit stood at US$903.5 billion in 2024, falling to just US$901.5 billion in 2025, a decline of 0.2 per cent, nowhere near the correction tariffs were meant to deliver.

The Dollar Bypass

The 10-year Treasury yield crossed 5 per cent in September 2026, and the Federal Reserve raised rates that same month for the first time since 2023, because inflation had run too high for too long to accommodate a cut.  The dollar’s share of global reserves has fallen from over 70 per cent in 2000 to under 59 per cent, with central banks buying a record 288.9 tonnes of gold in a single quarter of 2026 alone.  China’s own Treasury holdings fell to their lowest level since September 2008, redirected instead into German and Swiss sovereign bonds, markets offering the same political stability without the same risk of a single frozen account.  Trade is not abandoning the dollar wholesale.  It is diversifying away from concentrated exposure to it, because this administration is treating its own trade agreements as disposable.  This gives every trading partner fresh reason to hold fewer US dollars and less of this government’s debt than it did five years ago.

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Terence Nunis | Executive Chairman, Equinox Zenith | Author, The 1% Playbook: The Billionaire Cheat Code