On June 17, 1930, President Herbert Hoover signed the Smoot-Hawley Tariff Act, raising tariffs on over 20,000 imported goods to record levels. Over 1,000 economists signed a letter urging him not to. He signed it anyway. What followed was a cascade of retaliation, trade collapse, and the deepest depression in American history. Nearly a century later, the parallels are alarming.
The Comparison
| Factor | Smoot-Hawley (1930) | 2025 Tariffs |
|---|---|---|
| Effective tariff rate | ~20% (peak ~25%) | ~22.5% (and rising) |
| Products covered | 20,000+ goods | Virtually all imports |
| Process | Congressional legislation | Executive action (IEEPA) |
| Economist opposition | 1,028 signed petition | Broad consensus against |
| Retaliation | 60+ countries retaliated | All major partners retaliated |
| Trade collapse | US imports fell 66% (1929-33) | Trade volumes declining ~12% |
| Stated goal | Protect American farmers and workers | Protect American workers, reduce deficit |
| Actual outcome | Depression deepened, farm income collapsed | TBD โ early indicators negative |
What Happened After Smoot-Hawley
The Smoot-Hawley Act didn't cause the Great Depression โ it started before the act was signed. But it dramatically worsened it:
- Retaliation was immediate and massive. Canada, Britain, France, Germany, and dozens of other countries imposed retaliatory tariffs within months.
- World trade collapsed. Global trade fell from $5.3 billion in 1929 to $1.8 billion in 1933 โ a 66% decline.
- US exports were devastated. American exports fell from $5.2 billion in 1929 to $1.6 billion in 1933.
- Farm income collapsed. The tariff was supposed to help farmers. Instead, retaliatory tariffs on US agricultural exports destroyed farm income. Real farm income fell 60% between 1929 and 1932.
- The Depression deepened. GDP fell 30% between 1929 and 1933. Unemployment reached 25%.
Key Differences
The comparison is imperfect. Important differences include:
- The US economy is far larger and more resilient today. A 2025-style tariff war is unlikely to cause a 1930s-style depression.
- Central bank tools exist. The Federal Reserve can (and has) adjusted monetary policy to counteract tariff-driven inflation and slowdown.
- Safety nets exist. Unemployment insurance, SNAP, Social Security, and other programs cushion the blow.
- Services dominate. The US economy is 77% services, compared to ~40% in 1930. Services are less tariff-exposed.
However, these differences cut both ways. The modern economy's deep integration into global supply chains means tariffs have more disruption potential per dollar than in 1930, when supply chains were simpler and more domestic.
Key Similarities
1. The Retaliation Cascade
The most dangerous parallel is the retaliation spiral. In 1930, Canada retaliated first, then Britain formed the Imperial Preference system (a tariff bloc excluding the US), then Europe retaliated en masse. In 2025, China, the EU, Canada, and Mexico all retaliated within weeks. Japan, South Korea, India, and others followed. The pattern of escalatory retaliation is identical.
2. The Agricultural Devastation
Smoot-Hawley was sold as a way to help farmers. Retaliation destroyed agricultural exports instead. The 2025 tariffs followed the same pattern: agricultural retaliation has cost US farmers tens of billions in lost exports while doing nothing to help them compete domestically.
3. Economist Consensus Ignored
In 1930, 1,028 economists signed a letter to President Hoover urging him not to sign the tariff act. He signed it anyway, reportedly saying economists were "not always right."
In 2025, the economics profession is again nearly unanimous. A 2025 University of Chicago IGM Forum survey found that 95% of economists disagreed with the statement that the tariffs would improve American welfare. The policy moved forward regardless.
4. The Trade Bloc Response
After Smoot-Hawley, excluded nations formed trading blocs that shut the US out. Britain created Imperial Preference. European nations formed bilateral pacts. The US spent the next 15 years trying to rebuild trade relationships through the Reciprocal Trade Agreements Act and eventually the post-WWII Bretton Woods system.
In 2025-2026, a similar dynamic is emerging. The EU has accelerated trade negotiations with Mercosur, ASEAN, and India. The CPTPP (successor to TPP, which the US left) is expanding. China is deepening trade ties through the Belt and Road Initiative and RCEP. A world is forming that trades freely โ just not with the United States.
The Lesson
"Smoot-Hawley taught us that tariffs beget retaliation, retaliation begets isolation, and isolation begets impoverishment. We appear to be learning this lesson again."
โ Douglas Irwin, Dartmouth economist and trade historian
The recovery from Smoot-Hawley took decades. The Reciprocal Trade Agreements Act of 1934 began the process of lowering tariffs, but it wasn't until the GATT (1947) and eventually the WTO (1995) that the global trading system was fully rebuilt. If the current tariff regime persists, rebuilding America's trade relationships could take a generation.
Key Takeaways
- โ The 2025 effective tariff rate (~22.5%) has matched or exceeded Smoot-Hawley's peak
- โ The retaliation cascade mirrors the 1930s pattern almost exactly
- โ Agricultural devastation from retaliation follows the same playbook
- โ Trading partners are forming blocs that exclude the US โ just as after 1930
- โ Recovery from Smoot-Hawley took 15+ years of active trade diplomacy