How did the mongols Affect the medieval world

There are 2 effects how did Mongols affect the medieval world, these are a negative and positive effect. First, let's go to negative effect, the Mongol invasion of Europe sparked terror and disease which is called the Black Death; it was called a Black Death because they brought fleas across the continent and unleashing the plague on Europe that causes millions of people dead that decreases the population. Aside from that, Mongols controlled and conquered more than twice the amount of land with crops and livestock from others.

Second, the positive effect of Mongol is that there is a reopening of Silk Road Trading routes between China and Europe which increasing cultural exchange and wealth, there are spreading of technologies, cross-cultural interactions of the religion, transfer of scientific knowledge, and unification of Russia.