The History of the Arms Race

When Two Superpowers Pointed Everything They Had at Each Other

PICTURE THIS: at the height of the Cold War arms race, the United States and Soviet Union together possessed enough nuclear weapons to destroy every major city on Earth multiple times over. Not once. Multiple times. The term for this was MAD, Mutually Assured Destruction, and it was, somehow, the policy framework that kept the peace. The logic: if launching a first strike meant guaranteed annihilation of your own country in retaliation, no rational actor would launch. The entire architecture of global security for four decades rested on this logic, and on the assumption that the actors involved were, in fact, rational.

The arms race between the United States and the Soviet Union did not begin with nuclear weapons. It began with the recognition, in 1945, that the postwar world was going to be defined by competition between two superpowers with fundamentally incompatible visions of how human society should be organized. The weapons were the most visible expression of a competition that ran through every domain of political, economic, and scientific life.

Trinity and the Beginning

The arms race began on July 16, 1945, at 5:29 in the morning, in the New Mexico desert, when the United States detonated the first nuclear weapon. The test, codenamed Trinity, produced an explosion equivalent to roughly 21,000 tons of TNT. J. Robert Oppenheimer, scientific director of the Manhattan Project, reportedly quoted the Bhagavad Gita: "Now I am become Death, the destroyer of worlds." Three weeks later, atomic bombs were dropped on Hiroshima and Nagasaki.

The Soviet Union had been monitoring the American nuclear program through espionage. Klaus Fuchs, a German-born British physicist who worked on the Manhattan Project, passed detailed technical information to Soviet intelligence. So did other sources. When the Soviets tested their first nuclear device in August 1949, four years after Trinity, the American monopoly ended. The arms race, in the sense of competitive escalation toward parity and then superiority, was underway.

The Hydrogen Bomb and the Escalation

Fission weapons, which work by splitting atoms, are limited in yield by the amount of fissile material you can assemble. Fusion weapons, which work by forcing atoms together, are not similarly limited. Edward Teller and other American physicists pushed for development of a hydrogen bomb immediately after the Soviets broke the American atomic monopoly. Oppenheimer opposed it on ethical grounds and was later stripped of his security clearance, in part due to this opposition.

The United States tested the first thermonuclear device, Ivy Mike, in November 1952. The yield was approximately 10.4 megatons, roughly 700 times the Hiroshima bomb. The island of Elugelab in the Marshall Islands, where it was detonated, ceased to exist. The Soviet Union tested its own hydrogen bomb in August 1953. Yields escalated: the Soviet Tsar Bomba test in 1961, the largest nuclear weapon ever detonated, produced a yield estimated at 50 megatons. The fireball was visible from a distance of 1,000 kilometers.

The numbers became almost meaningless at a certain point. When a single weapon can destroy a city, the question of whether you have 100 or 1,000 such weapons is strategically significant but existentially irrelevant. The arms race continued anyway, driven by institutional momentum, domestic political pressures, and the genuinely uncertain military calculus of what constituted "enough."

Delivery Systems: The Race Within the Race

Nuclear warheads are only useful if you can deliver them. The arms race therefore also involved a parallel competition in delivery systems, which went through several distinct phases. Initially, strategic bombers were the primary delivery mechanism. The United States Strategic Air Command maintained bombers in the air at all times, ready to penetrate Soviet airspace. The Soviets developed their own bomber force and, crucially, improved air defenses.

Intercontinental ballistic missiles changed the calculation decisively. An ICBM could travel from the continental United States to the Soviet Union in roughly 30 minutes. It could not be shot down by existing technology. It could be launched from hardened silos that were difficult to destroy in a first strike. The deployment of ICBMs by both sides in the late 1950s and early 1960s created the hair-trigger situation that characterized the Cold War at its most dangerous.

Submarine-launched ballistic missiles added another layer. A submarine carrying nuclear missiles could lurk undetected anywhere in the ocean. Unlike ICBMs in fixed silos, submarines could not be destroyed in a first strike because their locations were unknown. They ensured that any country that launched a first strike, even a very successful one that destroyed all enemy land-based weapons and bombers, would still face devastating retaliation from submarines at sea. This became the ultimate guarantor of MAD.

Cuba: When It Almost Went Wrong

The Cuban Missile Crisis of October 1962 is the closest the world has come to nuclear war since 1945. American U-2 reconnaissance flights revealed Soviet medium-range ballistic missile installations under construction in Cuba. President Kennedy announced a naval blockade of Cuba and demanded the missiles' removal. Soviet ships carrying additional military equipment were heading toward the blockade line. Soviet submarines accompanied the ships. American destroyers began dropping practice depth charges to force the submarines to surface, not knowing that the submarines were armed with nuclear-tipped torpedoes and that at least one submarine commander, Vasili Arkhipov, was in a situation where he might authorize their use.

The crisis was resolved through a combination of backchannel diplomacy, a public deal (Soviet missiles out of Cuba in exchange for an American pledge not to invade), and a secret deal (American Jupiter missiles removed from Turkey). Kennedy and Khrushchev both wanted to avoid nuclear war and found a way to give each other enough to justify backing down.

The near-disaster produced some safeguards: the Moscow-Washington hotline, established in 1963, created a direct communication channel between the two governments. The Partial Test Ban Treaty in the same year stopped atmospheric nuclear testing, driven partly by genuine concern about radioactive fallout contaminating food supplies globally. These were real, if limited, steps back from the edge.

The Strategic Arms Limitation Talks

The SALT process, beginning in 1969, represented the first serious attempt to negotiate limits on nuclear arsenals. SALT I, signed in 1972, froze the number of strategic ballistic missile launchers at existing levels and established the Anti-Ballistic Missile Treaty, which limited missile defense systems on the logic that unlimited defenses would incentivize more offensive weapons to overwhelm them.

SALT II, signed in 1979 but never ratified by the U.S. Senate following the Soviet invasion of Afghanistan, set equal overall limits on strategic nuclear delivery vehicles. The Reagan administration initially rejected arms control frameworks, pursuing a significant buildup in the early 1980s. But the period also saw genuine near-misses: Soviet air defense shot down Korean Airlines Flight 007 in 1983, escalating tensions sharply. A Soviet early-warning system falsely indicated an American missile launch in September 1983; the officer on duty, Stanislav Petrov, decided not to report it as a genuine attack, a decision that may have prevented an automatic Soviet response.

The End Game

The arms race did not end with a dramatic decisive moment. It wound down through a combination of economic pressure on the Soviet Union, genuine change in Soviet leadership and thinking under Gorbachev, and arms control agreements that for the first time actually reduced rather than merely capped arsenals. The INF Treaty of 1987 eliminated an entire category of nuclear weapons. START I, signed in 1991, required both sides to reduce deployed strategic warheads significantly.

The Soviet Union dissolved in December 1991. The specific competition that had driven the arms race for four decades ended. The weapons did not. At current counts, the United States and Russia together still possess approximately 90% of all nuclear warheads in the world, totaling thousands of deployed and stored weapons. China, France, Britain, Pakistan, India, Israel, and North Korea have their own arsenals.

The arms race between the superpowers is over. The world it created, in which multiple countries possess weapons capable of ending human civilization, is the one we still live in. The history of the arms race is not finished because its consequences are not finished. Understanding how we got here is a precondition for thinking clearly about whether and how we get somewhere else.