What made Ming dynasty fall was multiple of factors. Such as lack of silver, a series of natural disasters, peasant uprisings, and finally attacks by the Manchu people.
Make generalizations.
Form a hypothesis.
Experiment.
The scientific method involves the identification of a problem which then leads to formulation of a hypothesis. Once the hypothesis is formulated an experiment is carried out and the data analyzed in order to reach a conclusion
Viceroy should be your answer hope this helps have a nice day