The black death which is population called as plague.
Step-by-step explanation:
It is medieval pandemic disease that is likely the bubonic plaque , it is generally associated with Europe. During the trade with the other countries or the settlement of other countries from the Europe the disease is spread throughout the world.
the bubonic plague is began in the northwestern china while the other cite as southwestern china . The three years later the plague killed over 90% of the hebei province population with the death totally over 5 million people.