Yale History Professor: We Are Sleepwalking Into The Next World War - And We're Running Out Of Time

ELI5/TLDR

A Yale historian argues that today’s world looks much more like the years before World War I than like the Cold War or the 1930s. The leading power is dismantling the system it built, a fast-rising power has no clear seat at the table, and old alliances are wobbling enough that nobody is sure who would show up in a real crisis. That mix of uncertainty, not the alliances themselves, is what made 1914 catastrophic — and it is what makes 2026 dangerous.

The Full Story

The wrong analogy

Odd Arne Westad opens by ruling out the two analogies people reach for most. The Cold War setting was bipolar, with two great powers in separate economic systems and no real integration. That is not us. The 1930s setting was a world already broken by a previous great war, with totalitarian ideologies and a collapsed economy. That is also not us.

The pre-1914 world, he argues, is the closer fit. A long period of great-power peace. Multipolar. Powers competing inside the same economic system. Deeply integrated by trade, capital, and technology — more so, relative to GDP, than today. And then it all came apart in a single summer.

“You can’t step into the same river twice. But it could still help alert us to some of the real danger signals.”

The first ingredient — the hegemon dismantling its own order

In the late 19th century, Britain ran the international order. Then it started taking the system apart. Domestic politics turned populist and nationalist. The story shifted: other countries are taking advantage of us, stealing our jobs, stealing our technology, and preparing to use it against us. Tariffs rose. Trade wars started. Britain’s mood turned inward.

Westad’s point: the United States is doing the same thing now, only faster and further. Britain never dismantled its own system to the degree that the US has in the last few years. The structural urge is identical. The execution is more aggressive.

Why a retreating hegemon causes war

This is the part that surprises people. The cause of war is not the hegemon weakening — it is the uncertainty that weakening creates.

In 1914, the question on every chancellery’s desk was: if a real crisis breaks out, what does Britain do? Will the French-Russian alliance hold? Does anyone actually believe in the existing rules? Germany did not start the chain reaction. But inside Germany, a growing camp argued: if a great clash is coming anyway, better now than later, while we still have a chance.

“It wasn’t the existence of alliances in 1914 that led to war. It was the uncertainty that had been created about whether these alliances would work.”

That is the eerie line. Alliances do not cause wars. Doubt about alliances causes wars. And the more quickly a leading power signals that it is no longer committed to the order it built, the wider that doubt spreads, and the more rising powers start calculating whether now is the moment to grab.

The second ingredient — a rising power with no role

Germany then, China now. Both grew faster than the establishment could absorb. Both wanted a position commensurate with their new weight. Both got contained instead of integrated.

Westad quotes his Yale colleague Paul Kennedy summarizing the British attitude toward Germany: “if you could only stop growing, little Hans, then everything would be fine.” Germany was not willing to stop growing. China is not willing to stop growing. The mistake — then and now — was assuming the rising power would politely curtail itself for the convenience of incumbents.

What Britain should have done was engage Germany inside European conflicts rather than try to turn those conflicts against it. What the US should do, by the same logic, is engage China in resolving disputes in Asia rather than treating every dispute as a vector for containment. There is nothing god-given about the United States, separated from East Asia by an ocean, being the decisive power in that region forever. The question is not whether China becomes the predominant power in East Asia. The question is how that transition happens.

The third ingredient — junior partners willing to take risks

In 1914 the spark was Austria-Hungary, Germany’s junior partner, willing to start a war in the Balkans because it could not imagine the consequences. Westad’s parallel today is implicit but obvious: a junior partner of a rising power, dragging the bigger one in. Russia in Ukraine fits the silhouette. So might others.

Why people cannot see it coming

Nobody alive has experienced a great-power war. Westad keeps making this point to policymakers: as many soldiers died in the first two weeks of the Battle of the Somme in 1916 as died in all great-power wars combined between 1815 and 1914. A regional war and a great-power war are not the same animal at different sizes. They are different animals.

Because we have not lived through one, we assume one cannot happen. In 1914, people expected a short, easy, regional war. They got four years of industrial slaughter. The assumption that “it can’t happen to us” was itself part of what made it happen.

What is actually different now

Westad is careful here. One real difference is that the United States has spent three generations building a dense web of alliances and friendships that Britain never had. That web could, in principle, be turned to advantage — used to stabilize the system rather than destabilize it. Whether the current US administration is interested in using it that way is another matter.

The other difference is that no rearrangement of the international system necessarily leads to war. Systems shift all the time. The question is whether the shift happens through negotiation or through a crisis nobody can control.

Key Takeaways

The historical parallel for today is pre-1914, not the Cold War and not the 1930s. Multipolar, economically integrated, post a long peace.
Pre-1914 globalization (trade and capital flows as % of GDP) was actually deeper than today’s.
The trigger for great-power war is not the decline of the hegemon itself but the uncertainty its decline creates about whether the existing rules still bind anyone.
Alliances do not cause wars. Doubt about whether alliances will hold causes wars.
Germany in 1914 was not the initiator but contained a faction reasoning “better now than later” — the most dangerous form of strategic logic a rising power can develop.
The Paul Kennedy line — “if you could only stop growing, little Hans” — captures the establishment failure mode. Rising powers will not slow down to suit incumbents.
The US has gone further and faster in dismantling its own postwar order than Britain ever did before 1914.
Great-power wars are not regional wars scaled up. The Somme killed more soldiers in two weeks than every great-power war between 1815 and 1914 combined.
Westad’s prescription for China is engagement inside disputes, not containment around them — same lesson Britain failed to apply to Germany.
The US alliance network is the one genuine structural difference from 1914, and the only real lever for stabilization, if used deliberately.

Claude’s Take

Westad is doing something that most geopolitics commentary does not do — picking the analogy carefully, defending the choice, and then pressing on the mechanism rather than just the vibes. The standard pundit move is to wave at the 1930s, mutter “Munich,” and feel important. Westad’s case for 1914 is more uncomfortable because the 1914 lesson is that no single leader chose the war. The system stumbled into it through accumulated uncertainty. That is much harder to fix than a single appeasement mistake.

The line that lands hardest is the one about alliances. It reframes the entire current European panic about NATO. The worry is not “what if NATO formally collapses.” The worry is “what if Moscow stops being sure NATO would actually fight.” That doubt alone is destabilizing, even if every treaty stays on paper. By that standard, the US is already producing 1914-grade uncertainty without any formal withdrawal.

Score 8 — high because the mechanism is well-articulated, the historical detail is real (not decorative), and the interview avoids the usual either/or moralizing about Trump or China. Half a point off for the truncation — the substantive end of the conversation sits behind a paywall, so we get the diagnosis but not the prescription in full. Another half off because Westad, like most pre-1914 analogists, slightly underweights the nuclear question, which is the one variable that genuinely did not exist in 1914 and arguably changes the calculus for everyone, including the “better now than later” faction.