4 years,  let me know if it is right.
        
             
        
        
        
Answer:
he and the colonists had agreed that a message would be carved into a tree if they had moved and would include an image of a Maltese Cross if the decision was made by force.
Explanation:
 
        
             
        
        
        
What happened after the collapse of the Ming Dynasty were:
1) there were natural disasters, war and rebellions.
2) earthquakes.
3) war against the Japanese.
4) unusually dry and cold weather.
5) plague
6) misrule
7) money crisis
8) rebellion from Li Zicheng's troops.
        
             
        
        
        
The answer is C. Ming dynasty