国共内战中蒋介石为什么输给了共匪。

>>陈纳德没坐牢呗

也就是说，你没有任何资料表明“embargo”不存在。

https://en.wikipedia.org/wiki/Claire_Lee_Chennault

Following the surrender of Japan in August 1945, Chennault retired from the Army Air Forces on October 31, 1945.
1945年陈纳德退役。
Chennault, unlike Stilwell, had a high opinion of Chiang Kai-shek and advocated international support for Asian anti-communist movements. Returning to China, he purchased several surplus military aircraft and created the Civil Air Transport (later known as Air America).[47] The aircraft facilitated aid to Nationalist China during the struggle against the Chinese Communists in the late 1940s and were later used in supply missions to French forces in Indochina[47] and the Kuomintang occupation of northern Burma throughout the mid- and late 1950s, providing support for the Thai police force. The same force supplied the US intelligence community and others during the Vietnam War.[48][49][50]
陈纳德私人购买飞机帮助国民党。
In 1951, now retired, Major General Chennault testified and provided written statements to the Senate Joint Committee on Armed Forces and Foreign Relations, which was investigating the causes of the 1949 fall of China to the communists. Together with Army General Albert C. Wedemeyer, Navy Vice Admiral Oscar C. Badger II, and others, Chennault claimed that the Truman administration's arms embargo had been a key factor in the loss of morale to the Nationalist armies.[51]
1951年调查的时候作证时陈述杜鲁门的禁运是共匪坐天下的原因。

陈纳德对国民党的帮助完全是个人行为，没坐牢是因为1951年美国人已经认识到杜鲁门的傻逼了。

不说明“embargo”不存在。