Chiang knew that in the long run the Communist unde Mao was a greater enemy compared to the Japanese. The Japanese population, then as in now, is only 10% of China's. Also, China ia a huge country and when the capital was moved from Nanking to Chungking, there was little that the Japanese infantryman can do but to move south to attack SEA countries.
Chiang agreed to join forces with Mao to fight the Japanese only after he was kidnapped by the Young Marshal. After the end of WW2, the Nationalist continued their fight with the Communist but eventually lost the civil war on the mainland mainly because the Chinese people (mostly dirt poor) supported Mao and who see the Nationalist as corrupt, elitist and incompetent .....
Just think, after the war, alot of industries in China were destoryed or damaged.Lack of food, and finanical was at that time in deep problem.What Chiang taking over was just a big piece of damaged China after the Japanese surrendered.And those poor Chinese farmers were made more poor due to the war.And as the war had already used up on most Nationalist resources and financial restrained , alot of local officials were taking bride.At that kind of time and enviroment, you can't do much but had to do things slowly at a time.Those who dare to say Chiang was corrupted, please use the brain to think hard.What can you do if you were Chiang at that time???
Before the Nationalist can recover from the war, the Communist started to wage a war the the Nationalist troops by taking over the Northern China.Chiang had to fight back of course.
With Mao under the order of Stalin to make China a Communist state, Mao started to accuse the Nationalist of corrupted and useless, and started to brainwash those poor farmers how bad Nationalist government was and brainwash the poor uneducated farmers of the greatness, the fairness, the democratic and the no corrupted communist system.So, one by one the poor farmers started to believe in Mao and join forces with the Mao Communist.Mao even promised them a democratic China then the dictator Chiang China.
Now just look back at history, what did Mao did after Chiang retreated to Taiwan island???Is China now more decmoratic???Freedom of speech?alot of party or just one communist party???Who started to be more dictator???Mao or Chiang???Who preserve the Chinese culture more?Mao or Chiang???Mao started.... China culture revolution that killed alot of educated teachers, religion peachers, churches, temples, school... destorying accesstor tomb... alot alot.He even order the killing of Ling Biao, whom helped alot in defeating the Chiang best troops.Alot alot of bad things can be said on Mao.And the moral infest in most China Chinese now can be seen by how the China done on food, enviroment and also their way of thinking.All these is caused by Mao and the Communist.
Really sad... because China can be a great country if Chiang Nationalist ruled China.At least the moral of the China can be more better then today.