Why did the diffusion of ideas and knowledge decrease during the Ming Dynasty?

The emperors instituted a policy of isolationism, which limited trade and outside influence.

Explanation:

The Ming Dynasty in China existed between 1368 to 1644 AD. It was widely popular for its trading activities across the world. Reaching as far as the West.

However, the diffusion of ideas and knowledge decrease during the Ming Dynasty resulted from the fact that the emperors instituted a policy of isolationism, which limited trade and outside influence.

This was evident in the prolonged disagreement between Zheng He and the Confucian scholars in the fifteenth century. Thereby resulting in the isolation policy. This limits trade and outside influence.

it was a act of seld fesnse more over it was a peace treaty between the fogein contunries.

the causes of the dust bowls were severe droughts,   lands became dry and hard, temperature was higher than usual, hot and dry conditions killed crops, high winds. because of those factors, the winds kicked up dry soil and created clouds of dust.