
Originally Posted by
bushbush
internal turmoil and external pressure. South Song was already ravaged for years by Liao and Jin (ethnic minority states who took over North) not long ago. The imperial court was corrupt; the army was weak; taxation was low. The same old story of the end of a chinese dynasty usually.
btw, they only conquered song after taking over much of central asia and came back from their invasions in Europe.
What they learned about firearms and etc was from their wars with Jin and Liao, who learned from the Chinese earlier on when fighting with Song.
ps: just one more thing romano, the mongols adopt some chinese cultures and institutions but not enough for them to earn the support of chinese land-owning exam-taking confucian ruling class. Thus Yuan lasted not even 100 years. The manchurians learned the lesson, conducted full scale assimilation and adoption, but lost their own identity after a few centuries. Thats the dilemma of trying to rule china i guess.