How did intercontinental ballistic missiles change the nuclear arms race?

The development of intercontinental ballistic missiles (ICBMs) fundamentally transformed the nuclear arms race by shifting the focus from bomber-based delivery to rapid, long-range strikes. Because ICBMs offered minimal warning time before impact, they rendered traditional air defenses largely ineffective and accelerated the transition toward a strategy of mutual assured destruction.1

This shift necessitated several strategic changes:

• Hardened Infrastructure: To protect against preemptive strikes, both superpowers placed ICBMs in "hardened" underground silos designed to withstand nuclear blasts.12
• The Nuclear Triad: ICBMs became one of three pillars in the nuclear triad, alongside strategic bombers and submarine-launched ballistic missiles. This diversification ensured that a nation could survive a first strike and maintain the capacity for a devastating second strike.3
• Technological Escalation: The race intensified as both sides developed multiple independently targeted reentry vehicles (MIRVs) to overwhelm defensive systems, eventually leading to arms control efforts like the Anti-Ballistic Missile (ABM) Treaty to confirm the primacy of offensive capabilities.1

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