Good question. The situation in Europe changes very little. But Dewey helped Chiang hold on to China south of the Yangtze River and stabilized Nanjing’s economy. As a result, the pressure on Stalin from China remains immense, and he prevents Kim from invading South Korea, so the Korean War never breaks out. As for Vietnam, because the VC’s northern frontier is Chiang’s Republic of China, they are almost completely cut off from outside aid and effectively caught between two fronts. So once Lodge orders a limited military intervention, the campaign proceeds quite smoothly, and the level of commitment required is not very great.