Chapter 1: Cold War 101: What It Is (And Why It Wasn’t Actually “Cold” for Most People)

On a humid June morning in 1950, 34-year-old Park Min-jun knelt in his rice paddy just south of the 38th parallel, the imaginary line that divided the Korean Peninsula into two halves. Three years earlier, he had celebrated the end of Japanese colonial rule, dreaming of a unified, independent Korea where he could farm his own land without foreign occupiers telling him what to grow. By noon that day, he was running for his life as artillery shells exploded behind him, the sky choked with smoke from North Korean tanks rolling south. Park Min-jun had no idea that the line he lived beside, and the war that was about to destroy his village, had been drawn 1,500 miles away in a grand palace in Crimea, by three men who had never set foot in Korea, who had spent the last five years fighting the same enemy, and who had decided his country’s fate over cognac and cigars in a single afternoon.

That afternoon in February 1945 was the Yalta Conference, where US President Franklin D. Roosevelt, British Prime Minister Winston Churchill, and Soviet Premier Joseph Stalin met to plan the end of World War II and the shape of the post-war world. At the time, the three were “allies,” bound together by a common enemy: Nazi Germany, which had conquered most of Europe and was fighting a brutal war against the Soviet Union on the Eastern Front, while the US and UK fought Germany in the west and the Pacific. But the alliance was always a marriage of convenience, not shared values. The US and UK had spent decades fighting the spread of communism, and had even sent troops to Russia in 1918 to help anti-Bolshevik forces overthrow the new Soviet government after the 1917 October Revolution. The Soviet Union, for its part, never trusted the Western powers, who had abandoned them to fight Germany alone for two years before opening a second front in Europe in 1944. By the time Japan surrendered in August 1945, ending World War II, the alliance had already begun to crack. Within two years, the US and USSR would be locked in a 45-year global standoff that would redraw maps, topple governments, kill millions, and bring the world to the brink of nuclear annihilation. That standoff is what we call the Cold War.

If you’ve never studied the Cold War before, you probably have a vague idea of what it was: a conflict between the US and the Soviet Union that lasted from the end of WWII to the collapse of the USSR in 1991, with no direct fighting between the two sides. That’s true, but it’s also a massive oversimplification, and it misses the most important part: for most people on Earth, the Cold War was not cold at all. It was a period of constant, bloody conflict, political repression, economic hardship, and terror that shaped every aspect of life for half the planet. This chapter will break down everything you need to know to understand the rest of this book: what the Cold War actually was, why it started, what the key terms mean, and why the “cold” label is one of the biggest misnomers in modern history. By the end, you’ll have the context to follow every map, every border change, and every conflict we cover in the chapters ahead.

The Breakup: How WWII Allies Became Mortal Enemies

To understand the Cold War, you first have to understand why the US and USSR, who fought side by side to defeat Nazi Germany, turned on each other so fast. The short answer? They were never really friends. The longer answer lies in two things: their opposing ideologies, and the power vacuum left when Nazi Germany collapsed.

Let’s start with ideology, a word you’re going to hear a lot in this book. Put simply, an ideology is a set of core beliefs about how society should be organized, what counts as “fair,” and what the ultimate goal of human progress is. It’s not just a political opinion—it’s a total worldview that claims to be universally true, and that its followers have a duty to spread it to the rest of the world. For the US and USSR, their ideologies were not just different—they were fundamentally, irreconcilably opposed.

The US’s ideology was (and is) liberal capitalism, built on three non-negotiable pillars: 1. Private property and free markets: The belief that individuals, not the state, should own land, businesses, and resources, and that competition in free markets is the best way to create wealth and prosperity for everyone. 2. Multi-party democracy and individual rights: The belief that governments should be chosen by free, fair elections, that people have inherent rights to free speech, free assembly, and free religion, and that no single group should have total control over the state. 3. Universal liberalism: The belief that these values are not just for Americans—they are universal human rights, and the US has a moral duty to spread them to the rest of the world, by force if necessary.

The USSR’s ideology was Marxist-Leninist communism, built on its own three core pillars: 1. Collective ownership of the means of production: The belief that private ownership of factories, land, and resources is inherently exploitative, because it lets a small class of wealthy owners profit off the labor of working people. The only fair system, they argued, is for all productive property to be owned collectively by the working class, managed by the state on their behalf. 2. Vanguard party dictatorship: The belief that capitalism will always try to crush socialist movements, so a single, disciplined communist party is needed to lead the working class to revolution, and to defend the new socialist state from internal and external enemies. Multi-party democracy, in their view, is just a tool for the wealthy to maintain power. 3. Global revolution: The belief that capitalism is inherently imperialist, and will always try to invade and destroy socialist states. The only way to guarantee the survival of socialism is to spread revolution to every country in the world, eventually replacing all capitalist governments with communist ones.

These ideologies were not just abstract theories—they were the foundation of every decision both sides made during the Cold War. And from the start, both sides saw the other as an existential threat. The US saw Soviet expansion in Eastern Europe as the first step in a global plan to conquer the world for communism. The USSR saw US support for anti-communist forces around the world as a plan to surround and destroy the first socialist state in history.

The second reason the alliance broke up was the power vacuum left when Nazi Germany collapsed. Before World War II, the world was dominated by European colonial empires: Britain, France, Germany, and the Netherlands controlled most of Africa, Asia, and the Middle East. But the war destroyed their economies and militaries. Britain was broke, owing the US $4.4 billion in war debt, and its empire was crumbling as colonies from India to Indonesia fought for independence. France had been occupied by Germany for four years, and its colonial empire in Southeast Asia and Africa was on the brink of collapse. There was no European power left to compete with the two emerging giants: the US and the USSR.

The US came out of WWII as the world’s dominant economic and military power. Its factories were untouched by the war, and it produced 50% of the world’s manufactured goods and 80% of the world’s cars. It had the only nuclear weapons in the world (it had dropped two on Japan in August 1945 to force its surrender), the largest navy and air force in history, and a monopoly on the global financial system, as the US dollar became the world’s reserve currency. The USSR, meanwhile, came out of the war as the world’s dominant land power. It had the largest army in the world, with 10 million troops stationed across Eastern Europe, which it had liberated from Nazi occupation. It had suffered 27 million deaths in the war, more than any other country, and was determined to never let a hostile power invade it again. It wanted