First of all, the fields are barren.

Genghis Khan once dreamed of making "everything under the blue sky a pasture in Mongolia". In the expansion of the Mongolian empire, countless cities were razed to the ground by Mongolian fighters. In West Asia, the farmland irrigation system established since the Babylonian period was completely destroyed, and a large number of fertile fields became wasteland.

Second, the population has fallen sharply.

In China, the prosperous Song Dynasty was destroyed by Mongolian aggression, and then the economy and culture stagnated or even regressed. In many cities, such as Yulong Chijie, Baghdad and Pace, the Mongolian army slaughtered a large number of local people, and some cities were even slaughtered many times, which greatly damaged local productivity.

Three. epidemic

In A.D. 1346, when the Mongolian army attacked Kafa, a port city in the Black Sea, it used a trebuchet to throw the bodies of people who died of the plague (the plague originated in Central Asia and was carried by marmots) into the city. Europeans have never been exposed to plague before, and then the plague spread widely in Europe and became the Black Death. This great plague made medieval Europe lose one third of its population, which was simply a disaster in human history!