I see no reason to think this way , China recovered very slowly from WWII , why can't I think that Mao with his "great leap forward" delayed the recovery that would naturally have happened anyway?
The People of Tiwan have been exploited by the Uninted States and Europe quite a lot , it seems that the most exploited nations turn out to be much more comfortable to live in than the ones most insulated from this exploitation.
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Look, Mao unified China. No one else had ever done this in all of recorded history. That is what he did that was an absolute sine qua non for Chinese progress. If you are building a highway, first you lay down a heavy layer of rocks and gravel, without which the pavement will crack and sink into the mud. That is what Mao did.
After that, he screwed up. The Great Leap Forward was a disaster and the Cultural Revolution an even bigger one.
Chiang also screwed up by oppressing the native Taiwanese, the Fukien Chinese that had been educated by the Japanese, and anyone in his own KMT party that opposed him. But, like Mao, he died, and with his death came progress.
Taiwan did not progress because it was exploited by the Americans and Europeans, but despite it. The base for Taiwanese progress was laid down by the Japanese, who were experts at unifying the diverse population that they found when they invaded in 1895. As the Japanese people rejected the Tojo dictatorship and embraced democracy when the US occupied Japan in 1946-50, the Taiwanese rejected the dictatorship as soon as Chiang's son slipped from power in the 1980's. The Taiwanese combined the best features of Sun Yatsen's KMT Constitution with the Japanese system and some features from the US.
Without Mao, China would not be even one country today, but several countries that would be played off against one another by everyone. Money from Taiwan and Hong Kong entrepreneurs were also crucial to the development of China that we see today.
Exploitation by the West is not the driving force behind the development of Taiwan. In these places, most businesses were not run by Americans or Europeans, but by Chinese.