From the analysis of productivity and mode of production, it is a historical retrogression that the Yuan Dynasty replaced the Song Dynasty. Of course, there was some progress in each period, such as in the field of science, but compared with the western powers in the same period, it was retrogressive. .

I'll list a few specific aspects, and you can find the information yourself.

Politically, Zhan Sen's hierarchy, racial discrimination,

Economically, it emphasizes grazing (pay attention to grazing, not agriculture) and ignores commerce.

Culturally, the Han nationality used to be enlightened.

However, due to its vast territory, the Yuan Dynasty invented a new and progressive political management system: the provincial system.

Generally speaking, the Yuan Dynasty was not prosperous, but its territory was relatively prosperous. West to the Danube ~ ~ ~