Chapter 50: World War II and the End of Progress
Core idea
The largest war in human history
World War II killed an estimated seventy to eighty-five million people — soldiers, civilians, victims of genocide and famine — across six years and almost every continent. It was the only war in which atomic weapons have been used. It was the war that produced the Holocaust, the deliberate state-organised murder of six million Jews along with several million others (Roma, disabled people, Soviet prisoners of war, political dissidents, gay men). It ended with two new superpowers, the wreckage of European and Japanese imperial systems, the founding of the United Nations, the Nuremberg trials, and the moral conviction — at least among the victors — that the old order of competing empires and unconstrained nationalism had to be replaced.
The Axis came closer to winning than later history admits
It is easy in hindsight to read Allied victory as inevitable. It was not. If Japan had refrained from attacking Pearl Harbor in December 1941, the United States might have remained on the sidelines for years; the war in the Pacific would have been between Japan and a depleted British Empire alone. If Hitler had not broken his nonaggression pact and invaded the Soviet Union in June 1941, Germany might have consolidated its hold on continental Europe rather than draining itself on the eastern front. The Axis lost in large part because of dictatorial overreach: both Hitler and Mussolini believed their own propaganda about effortless conquest, and both made strategic decisions that would have been recognised as catastrophic by any competent general staff.
Why it matters
Industrial progress turned out to be morally neutral
Before 1939, even cynical observers of human nature could plausibly believe that scientific and industrial advance carried a moral dimension — that more knowledge, more wealth, more technology would tend, on average, to make life better. After 1945, that belief was harder to hold. The same chemistry that produced fertilisers produced Zyklon B; the same physics that promised cheap energy produced Hiroshima; the same industrial logistics that delivered food and medicine delivered prisoners to extermination camps with timetable precision. Progress as a moral concept did not die in 1945, but it lost its innocence.
The peace was actually planned this time
Versailles in 1919 had tried to punish the loser; San Francisco in 1945 tried to build institutions. The United Nations Charter, signed in June 1945 by fifty founding member states, established a system of mutual obligations meant to prevent the kind of unmanaged crisis cascade that had triggered both world wars. The Bretton Woods agreements (1944) created the International Monetary Fund and the World Bank to stabilise the global economy. The Universal Declaration of Human Rights (1948) attempted to write a baseline of dignity into international law. The Marshall Plan (1948) rebuilt Western European economies rather than bleeding them dry. The institutions were imperfect, and the Cold War divided them along ideological lines, but the basic insight — that wars end better when winners take responsibility for stabilising losers — was a genuine learning from the catastrophe of 1919.
Key takeaways
Key takeaways
- World War II killed an estimated 70-85 million people, the largest death toll of any war in history.
- Adolf Hitler became German chancellor in 1933 and invaded Poland in September 1939, starting the European war.
- Benito Mussolini ruled Fascist Italy from 1922; Emperor Hirohito's Japan invaded China in 1931 and the wider Pacific in 1941.
- The Holocaust murdered roughly 6 million Jews along with 5+ million other victims: Roma, disabled people, gay men, Soviet POWs, political dissidents.
- Japan's December 1941 attack on Pearl Harbor brought the United States into the war; the June 1941 German invasion of the USSR opened the eastern front.
- The Soviet Union absorbed the bulk of Wehrmacht combat power and lost roughly 27 million people in the war.
- The US dropped atomic bombs on Hiroshima (6 August 1945) and Nagasaki (9 August 1945), killing an estimated 150,000+ civilians and forcing Japan's surrender.
- Hitler and Mussolini both died in April 1945; the war ended in Europe in May and the Pacific in September.
- The United Nations was founded in 1945; the Nuremberg trials (1945-46) established that 'just following orders' is not a legal defence against crimes against humanity.
Mental model
Read it as: Two upstream causes — the punitive Versailles peace and the rise of three fascist regimes — feed into a war whose two decisive turning points are Axis errors: Germany invading the USSR and Japan attacking Pearl Harbor. The Holocaust runs in parallel as state policy, not as a battlefield consequence. The institutions in green (UN, Nuremberg, Bretton Woods) are the deliberate effort to prevent a third repeat.
Legacy
The Holocaust as planned state policy
The Holocaust — the Shoah in Hebrew — is not adequately described as a “wartime atrocity.” It was a centrally planned, bureaucratically administered programme to exterminate every Jew in Europe, decided on at the Wannsee Conference in January 1942 and executed by a network of ghettos, deportation trains, mass shootings (the Einsatzgruppen killed roughly 1.5 million people in 1941-42 alone), forced-labour camps, and extermination camps. Auschwitz-Birkenau, the largest of the camps, used industrial-scale gas chambers to murder roughly 1.1 million people, the great majority of them Jews. Two thirds of Europe’s pre-war Jewish population — six million people — were killed. Other targeted groups included an estimated 250,000-500,000 Roma, around 250,000 people with disabilities (under the T4 “euthanasia” programme), several thousand gay men, and millions of Soviet prisoners of war. The Holocaust is the central reference point for modern human rights law and the founding case study in genocide prevention.
The atomic age begins
The Manhattan Project, founded in 1942, drew on prior German, British, and Canadian research and produced the first nuclear weapons by July 1945. On 6 August 1945 the United States dropped a uranium bomb on Hiroshima; on 9 August, a plutonium bomb on Nagasaki. Estimates of the immediate and short-term death toll range from 110,000 to over 200,000 people, almost all civilians, with tens of thousands more dying of radiation injuries in the following years. Japan surrendered on 15 August. The strategic and moral debates over whether the bombings were necessary, justified, or proportionate continue eighty years later, but the technical demonstration was clear: humanity now had the ability to destroy itself, and would spend the rest of the twentieth century building international institutions and arms control regimes to manage that fact.
Example
Why “just following orders” stopped being a defence
At the Nuremberg trials in 1945-46, twenty-two senior Nazi officials were prosecuted for war crimes, crimes against peace, and the new category of crimes against humanity. Many defendants raised the Befehlsnotstand defence — that they had been ordered to participate in atrocities by their superiors and had no choice but to comply. The tribunal rejected this defence categorically. Its position was that there are commands no human being is legally entitled to obey, and that ordinary moral judgement remains operative even inside a chain of command.
This was a genuine innovation in international law. Before Nuremberg, the assumption was that states bore responsibility for their own citizens’ actions, and that individual soldiers and officials could not be prosecuted by external authorities. Nuremberg established that some categories of crime — genocide, mass murder of civilians, deliberate cruelty during war — are subject to universal jurisdiction, and that participation in them is the personal responsibility of the participants regardless of orders. This principle underlies every subsequent international criminal tribunal, from the ad hoc courts for the former Yugoslavia and Rwanda to the permanent International Criminal Court in The Hague. It is one of the most important things the catastrophe of WWII left behind.
Related lessons
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