---
title: "Salt II | Honors World History"
description: "Salt II was a 1979 U.S.-Soviet arms control treaty that capped strategic nuclear weapons and showed how Cold War diplomacy tried to slow the arms race."
canonical: "https://fiveable.me/hs-honors-world-history/key-terms/salt-ii"
type: "key-term"
subject: "Honors World History"
unit: "Unit 9"
---

# Salt II | Honors World History

## Definition

Salt II was the 1979 U.S.-Soviet arms control agreement that aimed to cap strategic nuclear weapons during the Cold War. In Honors World History, it shows how leaders tried to manage the arms race without ending rivalry.

## What It Is

Salt II was a Cold War arms control treaty signed in 1979 by the United States and the Soviet Union to limit strategic nuclear weapons. In Honors World History, you usually see it as one of the main attempts to slow the arms race after decades of rapid military buildup.

The name stands for Strategic Arms Limitation Talks II. That matters because Salt II was not just a random peace gesture, it was part of a longer negotiating process. Salt I had already set the pattern for talks between the superpowers, and Salt II tried to extend that effort by putting ceilings on strategic ballistic missile launchers and strategic bombers.

The treaty fit the logic of nuclear deterrence. Both sides had so many weapons that a direct war could destroy both countries, so limiting certain categories of weapons seemed safer than letting the stockpiles keep growing. In practice, this was about keeping the balance of power stable while avoiding another expensive round of buildup.

Salt II was signed by Jimmy Carter and Leonid Brezhnev in June 1979, but signing and ratifying are not the same thing. The U.S. Senate never formally ratified it, especially after the Soviet invasion of Afghanistan in December 1979 changed public and political attitudes toward the USSR. That is a classic world history pattern, treaties can be carefully negotiated and still break down when events on the ground shift the political climate.

The treaty also included verification and inspection ideas, which shows another big Cold War theme: trust was limited, so arms control depended on transparency, monitoring, and proof. Even when a treaty is not fully implemented, it can still shape later diplomacy. Salt II helped set the stage for later arms reduction talks, including the START agreements in the late 1980s.

For this course, the easiest way to think about Salt II is as a symbol of late Cold War tension. It reflects both cooperation and suspicion at the same time. The superpowers were willing to negotiate, but neither side stopped seeing the other as a threat.

## Why It Matters

Salt II matters because it shows that the Cold War was not only about military rivalry, it was also about managing that rivalry through diplomacy. When you study the arms race, you are not just memorizing weapons systems. You are tracing how fear, strategy, and politics pushed the U.S. and Soviet Union to search for limits without fully trusting each other.

It also helps explain why Cold War history is full of half-successes. A treaty can be signed, praised, and still fail to become fully effective because of a crisis like Afghanistan, public pressure, or changes in leadership. That makes Salt II a good example of how foreign policy depends on events outside the negotiating table.

In essays and short responses, Salt II is useful evidence for the idea that détente and arms control were fragile. It fits alongside other efforts to reduce tension, but it also shows how quickly those efforts could unravel when superpower relations worsened. If you are comparing policies, Salt II gives you a clear example of limited cooperation inside a very competitive Cold War system.

## Connections

### Arms Race

Salt II is one response to the arms race, the competition between the United States and the Soviet Union to build more and better nuclear weapons. Instead of adding to the buildup, the treaty tried to freeze or slow it. That makes Salt II a useful example of how the Cold War could shift from pure escalation to negotiation.

### Nuclear Deterrence

The logic behind Salt II depends on nuclear deterrence, the idea that huge nuclear arsenals prevent war because both sides know the cost would be unbearable. If each side already has enough weapons to retaliate, building even more may not increase security. Salt II reflects that thinking by trying to limit weapons rather than chase unlimited superiority.

### [Arms Control](/hs-honors-world-history/key-terms/arms-control)

Salt II is a major example of arms control, meaning agreements meant to limit, monitor, or reduce weapons rather than abolish them instantly. In world history, arms control is different from disarmament because it usually works step by step. Salt II shows the practical side of Cold War diplomacy, where rules and inspections were used to manage risk.

### [Non-Proliferation Treaty](/hs-honors-world-history/key-terms/non-proliferation-treaty)

The Non-Proliferation Treaty addresses the spread of nuclear weapons to more countries, while Salt II focused on limiting the two biggest nuclear powers. Together they show two different ways countries tried to reduce nuclear danger. One tries to stop new states from joining the nuclear club, and the other tries to slow the superpowers' buildup.

## On the AP Exam

A quiz or essay prompt might ask you to identify Salt II as part of Cold War arms control and explain why it did not fully take effect. The move is usually to connect the treaty to the broader arms race, then point out the break between agreement and ratification after the Soviet invasion of Afghanistan. If you see a document question, look for language about limiting missiles, bombers, inspections, or U.S.-Soviet tension. In a timeline task, place Salt II in the late 1970s as a sign of cautious diplomacy before Cold War relations worsened again.

## Salt II vs Salt I

Salt I and Salt II are easy to mix up because they are both Strategic Arms Limitation Talks agreements. Salt I came first and set an early framework for limiting strategic weapons, while Salt II tried to build on that work with more detailed limits. If a question mentions 1979, Carter, or the Afghanistan invasion, it is Salt II.

## Key Takeaways

- Salt II was a 1979 U.S.-Soviet arms control treaty designed to limit strategic nuclear weapons during the Cold War.
- It was part of the larger effort to slow the arms race, not to end Cold War rivalry altogether.
- The treaty was signed by Jimmy Carter and Leonid Brezhnev, but the U.S. Senate never fully ratified it after the Soviet invasion of Afghanistan.
- Salt II shows how nuclear deterrence pushed superpowers toward negotiation, verification, and limits on weapons buildup.
- Even though it was not fully implemented, Salt II influenced later arms reduction talks and remains an important late Cold War example.

## FAQs

### What is Salt II in Honors World History?

Salt II was a 1979 arms control treaty between the United States and the Soviet Union. It aimed to limit strategic nuclear weapons like ballistic missile launchers and bombers during the Cold War. In class, it usually comes up as evidence of both cooperation and mistrust between the superpowers.

### How is Salt II different from Salt I?

Salt I came earlier and established the first major limits on strategic weapons, while Salt II tried to extend and tighten those limits. Both were part of the same arms limitation process, but Salt II is tied more directly to late 1970s diplomacy and the breakdown in U.S.-Soviet relations after Afghanistan.

### Why did Salt II fail to be ratified?

The U.S. Senate never formally ratified Salt II because relations with the Soviet Union worsened after the Soviet invasion of Afghanistan in 1979. That event made the treaty politically harder to support in the United States, even though it had already been signed. It is a good example of how world events can derail diplomacy.

### How do you use Salt II in a history essay?

Use Salt II as evidence that Cold War leaders tried to manage nuclear danger through negotiation, not just military buildup. It works well in essays about the arms race, détente, or the limits of superpower cooperation. If you mention why it stalled, you can also show how quickly political tensions returned.

## Related Study Guides

- [9.4 The arms race](/hs-honors-world-history/unit-9/arms-race/study-guide/qqcdPqia6shvP7Q0)

## About This Document

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