Another box to check in the historical parallels between the Coolidge and Trump eras—and one of the most consequential. Earlier this week we noted a sharp structural rhyme between these two periods. Now the oil market is delivering yet another: a foreign policy crisis involving petroleum creates a temporary price spike that gets overwhelmed by a supply surge from the world's swing producers, driving prices dramatically lower and fueling the economic expansion that powers a historic bull market.

The names have changed. The structure hasn't. In both eras, the playbook runs the same way: crisis spikes oil, supply responds to the price signal, the crisis resolves, production floods the market, cheap energy turbocharges growth, and stocks rip higher. Let's walk through it.

Act I: The Crisis

Both presidents confronted foreign policy crises that directly threatened global petroleum supply—and appeared, to contemporaries, capable of sustaining permanently elevated oil prices.

In December 1926, Mexico's President Calles signed a petroleum law nationalizing subsoil rights. Mexico was the world's second-largest oil producer at the time, and roughly 70% of its output was controlled by American firms that now faced outright forfeiture. Washington talked openly about military intervention. Oil peaked at $1.88 per barrel amid the uncertainty.

Fast forward to February 28, 2026. U.S.-Israeli strikes on Iranian nuclear and military targets triggered threats of a Strait of Hormuz closure—a chokepoint through which 18 million barrels per day flow, representing 20% of global petroleum trade. WTI surged to $90 per barrel on fears of a prolonged disruption. QatarEnergy declared force majeure on 20% of global LNG supply. Marine war-risk insurance was cancelled across the Persian Gulf.

In both cases, the crisis appeared genuinely threatening. And in both cases, what came next mattered far more.

Act II: The Supply Response

Here is where the parallel becomes powerful. In both eras, the world's swing producers—responding to price incentives—unleashed production that overwhelmed the geopolitical fear premium.

The Seminole Flood (1927)

Oklahoma's Seminole field, discovered in late 1926, erupted into full production just as the Mexico crisis peaked. The timing was almost theatrical. Seminole reached 500,000 barrels per day from a single field—adding roughly 20% to national production virtually overnight. Total U.S. output surged to 907.75 million barrels in 1927, up over 10% from the prior year. Advances in cracking technology meant each barrel yielded 14 gallons of gasoline versus just 4 gallons in 1910, amplifying the effective supply surge even further.

Oil prices collapsed 31% in 1927 and fell another 10% in 1928, reaching $1.17 per barrel—38% below the 1926 peak. The Mexico crisis eventually resolved diplomatically when Coolidge appointed Dwight Morrow as Ambassador. But by the time diplomacy succeeded, supply had already rendered the geopolitical premium irrelevant.

The Triple Supply Surge (2026)

The $90 WTI spike creates an even more powerful incentive for today's swing producers. At that price, every marginal barrel on the planet becomes wildly profitable—and the hedging stampede that began the moment markets opened on March 3 accelerates exponentially.

U.S. Shale—the "New Seminole." Producers entered this crisis with only 21% of 2025 and 4% of 2026 production hedged—the lowest ratio in years—giving them enormous room to lock in crisis prices. At $90, the incentive to hedge forward through 2027 is overwhelming. Permian DUC (drilled but uncompleted well) inventory provides a weeks-not-months supply response. ExxonMobil's Permian assets remain economic at $50 WTI; hedges at $90 make aggressive drilling an absolute certainty, with returns approaching 80–100% above breakeven.

Saudi Arabia—the swing producer. The Kingdom had already boosted output and rerouted exports before the strikes as a contingency. The East-West Pipeline to Yanbu on the Red Sea has 5 million bpd capacity, expandable to 7 million—a bypass route proven during the 2019 Abqaiq response. OPEC+ agreed on March 1 to add 206,000 bpd in April with flexibility to accelerate the phase-out of 2.2 million bpd of voluntary cuts. At $90, the economic incentive to accelerate that entire unwind is irresistible.

Venezuela—the bonus barrel. The U.S. expanded Chevron's license in January 2026. Chevron had already ramped joint venture production 30% through 2025 via well reactivation. At $90, even marginal Venezuelan wells with high lifting costs become profitable, accelerating the return toward 1.1–1.2 million bpd by mid-2026.

Act III: The Price Collapse

The mechanism is identical across both eras: crisis-inflated prices incentivize production that overwhelms the market once the crisis resolves. The higher the spike, the more violent the supply response—and the steeper the subsequent decline.

From 1926 to 1928, oil fell 38% despite the Mexico crisis—because Seminole production was physical and immediate, Mexico's decline was already structural (geological depletion, not politics), and cracking technology improvements amplified effective supply per barrel.

The same mechanism applies now, but with an added layer of financial engineering. The hedging contracts signed at $85–90 during March 2026 represent a commitment to future production that cannot be unwound. Every swap contract is a barrel that will be produced in the second half of 2026 and through 2027 regardless of where spot oil settles when Iran folds.

Here's how the timeline projects:

Act IV: Cheap Oil Powers the Bull Market

The transmission mechanism from falling oil to rising stocks operates through five channels, all active in both eras.

Consumer spending power. Every $10/bbl decline in WTI reduces average U.S. gasoline prices by approximately 25 cents per gallon. A decline from $90 to $48 saves the average American household roughly $1,200 per year—effectively a massive tax cut financed by the evaporation of the fear premium. In the 1920s, this same dynamic drove automobile registrations from 20 million in 1925 to 26 million by 1929 as operating costs fell.

Corporate margin expansion. S&P 500 earnings are projected to grow 12% in 2026 and 10% in 2027 before accounting for an oil price tailwind. A $40 decline from peak to trough reduces energy input costs across every sector—industrials, transportation, agriculture, data centers. In the 1920s, total factor productivity grew 3.7% annually as cheap energy powered manufacturing and construction.

Fed policy space. In mid-1927, the Fed eased monetary policy because low inflation—aided by falling commodity prices—gave policymakers room. That easing contributed directly to the 1927–1928 stock market surge. Today, falling oil prices reduce headline inflation, giving the Fed room to continue the easing cycle. A $90-to-$50 collapse would virtually guarantee continued rate cuts through 2027.

Technology multiplier. The 1920s oil collapse coincided with three transformative technologies: electrification, automobile mass production, and radio broadcasting. Cheap energy accelerated adoption of all three. Today's AI revolution parallels that era's electrification. Cheap energy reduces data center operating costs—electricity is 30–40% of AI compute costs—directly supporting the buildout that drives productivity gains across the economy.

Capital flows and confidence. In the 1920s, foreign capital flowed into U.S. markets as America became the world's premier investment destination. Today, over $2 trillion in Middle East sovereign wealth fund commitments, combined with European and Asian capital seeking safety from regional instability, channels foreign investment into U.S. equities. The Iran crisis paradoxically accelerates this: Gulf sovereign wealth funds reroute assets away from regional risk and into dollar-denominated safety.

The Scorecard: Then and Now

Applying the identical Coolidge-era annual returns to the S&P 500: from the December 2025 close near 6,845, a 28.75% gain projects the index to approximately 8,813 by year-end 2026. A subsequent 48.22% gain from that level projects to approximately 13,063 by year-end 2027, with continued gains into the final leg of the run before the cycle matures.

These are extraordinary numbers. But so were the Coolidge-era returns that produced them. The Dow's 48.22% gain in 1928 seemed impossible before it happened.

Why the Supply Surge Is More Certain This Time

In 1927, the supply surge was accidental. Wildcatters stumbled onto the Seminole field. The overproduction was unplanned, chaotic, and initially unwelcome—producers scrambled for proration agreements that repeatedly failed.

In 2026, the supply surge is financially engineered at $90 per barrel. At that price, every U.S. shale basin is wildly profitable—Permian breakevens sit at $45–55, Bakken at $50–60, Eagle Ford at $48–55. A $90 hedge provides 60–100% returns above breakeven. The 32 oil rigs lost since June 2025 will return within weeks, and additional rigs will be mobilized. Nearly a thousand Permian DUCs become immediate completion targets. OPEC+ has overwhelming economic incentive to accelerate the full 2.2 million bpd unwind. Even marginal Venezuelan wells become profitable.

The hedging contracts signed at $85–90 represent a financial commitment to future production that cannot be unwound. Every swap contract is a barrel that will be produced regardless of where spot settles. This is the Seminole flood—engineered, financed, and contractually guaranteed at crisis prices, then delivered into a post-crisis market where the fear premium has disappeared.

The Rhyme Completes

Ninety-nine years apart, two presidents confront nearly identical oil market dynamics:

The mechanism is the same. The incentives are the same. The technology-driven economic backdrop is the same. The swing producers are the same—America and Saudi Arabia. The financial engineering is, if anything, more reliable in 2026 because forward hedging contractually commits production that wildcatting in 1927 produced only by geological accident.

Oil down. Stocks up. The rhyme is playing out in real time.