What caused the Mongol Empire to break into separate regions ruled by separate leaders? O Cities around the empire split away and became independent nations.
O The economy of the empire fell apart due to a lack of trade and business.
A struggle for power among Genghis Khan's sons and grandsons led to civil war.
O Groups throughout the empire built armies and overthrew the Mongols.

10 points per question and brainlist 1. name four of the ruling dynasties of china. describe at least three contributions to society from each dynasty. 2. why did the qin ruler zheng burn chinese literature and philosophy books? how did the han dynasty establish a strong and effective government? why did people rebel against the sui rule? 3. what new technologies were invented during the tang dynasty and fully developed in the song dynasty that would eventually have a great impact on the world? explain why this technology had such an impact. 4. who were the invaders that seized control and took over the song dynasty? 5. how was china's history affected by its policies of isolation from the outside world during the ming dynasty?