Rough possible background timeline for eventsViet Minh was created during WW2(the CCP asked them IIRC), it always was communist but it prioritized the independence of Vietnam over proletarian revolution.
In the 1930s Chiang is still there, he still isn't the most popular leader of the world and he still would face difficulties against the Japanese. Even if Chiang or who replaces him does every single thing right and has an incredible luck he still wouldn't be able to win since France who has a much, much better army than him failed to take Indochina back after 8 years of fighting, the KMT won't be able to conquer Indochina or puppet it, it doesn't have the geopolitical reach to do so without direct intervention either.
1927-1933: The CCP is more swiftly weakened in the extermination campaigns of the 1930s. Mao and/or other key leaders are killed or captured while the rest of the communists try to escape north.
1930-1934: Chiang Kai-shek is ousted or sidelined (made to retire to a prestigious but largely ceremonial role) by more competent and populist leaders in the KMT. They embark on a more socialist interpretation of Sun Yat-sen's political philosophy, while reining in corrupt interests. The political shifts in China also affect the Korean government in exile and revolutionaries in Vietnam.
1931-1938: The KMT builds up its army while trying to buy time with the Japanese as IOTL. The Japanese spend more time trying to break off North China from KMT control, and the KMT let them do it because the more time they have to build up their army, the better. However, the greater focus on economic intervention/socialism cancels out the extra time the Chinese have so their army in 1938 is about as materially good as it was IOTL 1937, just more motivated and united. Communists still exist in Shaanbei/Ningxia area but are a lesser threat. The Wang Ming faction takes over which is more dogmatically pro-USSR but worse than Mao at adapting to China's conditions.
1938-1941/2: TTL's Second Sino-Japanese war breaks out. The specific circumstances and battles are obviously different but the main gist is similar. However, Wuhan and Taiyuan become the Stalingrad and Leningrad of the Chinese war effort, and either do not fall to the Japanese, or fall but are retaken in a fairly timely manner. This limits the presence of the IJA in China proper and sets the ROC up for a more successful war effort in general. In 1941 or 1942, as IOTL, the Japanese-US confrontation over Japan's expansion boils over and turns into a Pacific War.
1941/2-1945: Pacific War goes roughly similarly to OTL; meanwhile WW2 in Europe happens in a similar manner as well, though some things are changed like maybe the Russians lose more or less men resulting in more or less of Germany being captured at the end. In China, the ROC manages to liberate most of its territory as the Japanese are being hounded by the US navy and air force. Burma does not fall to Japan, making the Burma Road open to China from the beginning and not the subject of a massive and grueling operation with limited benefit. Instead of the CCP taking the insurgent role, the KMT's paramilitary and intelligence/reconnaissance units do this work instead as the OTL Juntong was intended to. They also extend their operations to Indochina, working with and influencing the organization that would become the Vietminh.
1943-45: The Allies discuss the postwar world. China's improved performance compared with OTL makes it a more credible power. The US supports its recovery of Manchuria, Taiwan, Xinjiang, Tibet, and the foreign concessions. Looking for an ally against the USSR in the postwar, the US also nudges things towards greater Chinese influence in mainland East Asia. The Soviet Union does not invade Manchuria, thinking instead that it is advantageous for the KMT to have to fight the Guandong Army. Thus the Chinese have to mount a tough and costly campaign to get through the Shanhai Pass and even with US support and nuclear bombs against Japan this takes some more time until the IJA in Manchuria finally surrenders in very late 1945 or early 1946.
1945- : Things are set up to develop as I described in earlier posts. The French are not happy but they are also functional losers among the Allies.
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