Why did the Pax Mongolica provide a time of peace and prosperity for the Mongols?

the conditions that made the byzantine empire vulnerable to attacks by the muslin turks were the sack of constantinople by western crusaders, the conquests of the sultanate of rum, presence of rival kingdoms and finally the set up of fiefdoms at the empire which were owned by the ghazis (turkish warriors).

this act gave the federal government the power to relocate any native in the east to territory west of the mississippi river.