Potsdam Conference: How the Big Three Set the Tripwires for the Cold War

In July 1945, inside the Cecilienhof palace in a ruined Germany, the leaders of the United States, Britain and the Soviet Union met to plan the post-war world. This episode examines the Potsdam Conference of July 17 to August 2, 1945, and argues that while the Big Three drafted agreements and ultimatums, they were really laying the groundwork for the Cold War. It sets the scene with a changed cast: Harry Truman replacing Franklin Roosevelt and abandoning conciliation for suspicion, Winston Churchill voted out mid-conference and replaced by Clement Attlee, and Joseph Stalin as the only veteran, already occupying much of Central and Eastern Europe.

The episode walks through the division of Germany and Austria into four occupation zones, the exclusion of France, the five D's of demilitarization, denazification, democratization, decentralization and decartelization, and a reparations system that physically unbolted factories and shipped them east. It covers the shift of Germany's border to the Oder-Neisse line, the abandonment of the Polish government in exile, the so-called orderly and humane transfers of ethnic Germans that killed hundreds of thousands, and the moment Truman told Stalin about a new weapon of unusual destructive force without realizing Soviet spies had already briefed him.

• Why Truman wrote in his diary that Stalin was honest but smart as hell, and what honest meant in the language of transactional diplomacy
• How Potsdam differed from Versailles by seeking the physical eradication of Germany's capacity to wage war rather than abstract financial debt, and why that created a dangerous vacuum
• How shrinking Germany by roughly a quarter of its 1937 territory locked Poland into permanent dependence on Soviet protection
• The Potsdam Declaration of July 26, Japan's mokusatsu response, and why the ultimatum functioned like a geopolitical dead man's switch
• The rapid aftermath: Hiroshima on August 6, Nagasaki on August 9, the Soviet invasion of Manchuria, and the Iron Curtain descending within 18 months