Islamic and East Asian empires

The Islamic empires are similar to Tokugawa Japan and Ming/Qing China in that both discouraged innovation. They were both similar in these aspects, because both lands had rulers who feared that innovation would lead to change and destablization of the empire. In China and Japan, this fear was more politically oriented than the Islamic empires, who feared more about the weakening of Islam, which was the base of the empires they founded. They were different in that the Columbian exchange affected the Islamic empires much less than they did the Japanese and Chinese empires. This was because the Islamic empires were already capable of cultivating all their land, while the Chinese and the Japanese were only able to cultivate a very little portion of their land, as little as 11% before the arrival of American food crops. The American food crops would give the Chinese and the Japanese much more land to cultivate, while it really would not make that much of a diffence in the Islamic empires, where all the land was already cultivatable, so China and Japan would see a much more steady increase in population.