What contributed to the failed mongol invasions of japan?

  In the two invasions, the Mongol ships faced a typhoon that diminished the fleet. And it also demonstrates the inability of them to mount a successful naval invasion.

Explanation:

  The invasions were two the first in 1274 and the second in 1281. They were led by Kublai Khan. The failure of the invasions set a limit on Mongol expansion and was a nation defining event in the history of Japan.

  The fact that two typhoons diminished the Mongol fleet on the invasions helped to perpetuate the belief in the Japanese that they would never be conquered or defeated. A feeling that lasted until the end of World War II.

  I hope this answer helps you.

could you go a bit more in depth with you question? it's quite hard to understand. as soon as you do that i will be glad to : )