Ch6-1 · 缓和终结：苏联入侵阿富汗 1979 与卡特主义

How far do you agree that the Soviet invasion of Afghanistan in 1979 was the main cause of the collapse of Détente?（15 分 · 分析 + 判断）

• 同意方：阿富汗是压垮缓和的最后一根稻草；卡特因此撤 SALT II、断贸易、扩军；奥运抵制；为里根强硬路线铺路。
• 反对方（更稳的论点）：缓和此前已因苏联第三世界扩张、赫尔辛基人权反噬、勃列日涅夫病重、伊朗革命、人质危机而摇摇欲坠；Source P 明言"不是单一行动，而是疑虑积累"。
• 最佳答案：承认阿富汗是催化剂，但强调结构性脆弱才是根因，给出平衡判断。

第一步先定义"collapse of détente"的时间边界（约 1979）；第二步列"阿富汗之前"的 5 条背景链证据；第三步用 Source N/P 支撑"积累论"；第四步给判断——阿富汗是 catalyst 而非 sole cause，给一个"程度副词"（largely / partly / to a limited extent）。

The collapse of Détente was a process, not a single event, and the Soviet invasion of Afghanistan in December 1979 is best understood as its catalyst rather than its sole cause. By the time Brezhnev sent tanks into Kabul, the relationship had already been eroding for several years.

Several factors had weakened Détente before 1979. First, Soviet expansion in the Third World — in Angola, Mozambique and Ethiopia — was interpreted by American neo-conservatives as proof that communist ambitions had not diminished, feeding domestic pressure to abandon the policy. Second, the Helsinki Accords of 1975, which committed signatories to human-rights standards, backfired on Moscow as its violations fuelled Congressional criticism. Third, Brezhnev's failing health from the mid-1970s made Soviet decision-making slow and gave figures like Brzezinski room to push a harder line. Fourth, the 1979 Iranian Revolution removed a pro-American shah and produced a violently anti-American regime, while the Tehran hostage crisis (from November 1979) symbolised American impotence and radicalised US opinion.

The Afghan invasion undoubtedly accelerated the breakdown. Carter, who had initially hoped to continue Détente, responded with striking stridency: he withdrew SALT II from the Senate, cut trade, encouraged a Western boycott of the 1980 Moscow Olympics, and authorised Presidential Directive 59 to expand the nuclear arsenal. As Source N notes, the invasion, combined with turmoil in Iran and the Horn of Africa, convinced the USA that Soviet designs extended to the Persian Gulf, prompting a return to militarised containment. Source P reinforces that no single Soviet act turned the scale; rather, an "accumulation of worries" widened suspicion beyond predictable hawks.

In conclusion, Afghanistan was the trigger that made the end of Détente public and irreversible, but the policy was already hollow. Détente had always been "the continuation of the Cold War by other means" (Unit summary); once it no longer served either side's interests, it collapsed. The invasion was therefore necessary to end the pretence, but not sufficient to explain the underlying fragility.

• ☐ 有没有先定义"collapse of détente"？
• ☐ 有没有列 1979 年前的背景证据（不只谈阿富汗）？
• ☐ 有没有引用 Source N / P 并解释？
• ☐ 结尾判断是不是"平衡式"（catalyst + structural cause）而非一边倒？