Your answer is
Going to be global warming
        
             
        
        
        
Just did it ,it is A good luck ,you dirty cheaters 
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Answer:
Teotihuacan. The Teotihuacan's are located in modern day Mexico. It was one of the largest cities in its time. It's strong military was known around the area. Similarities. Both were very large compared to most cities in their area. Teotihuacan and Cahokia.
Explanation:
 
        
             
        
        
        
Answer:
Looking at the options I think that it would be bad weather.
A.Bad weather
Explanation:
B.Bandits are a hazard and can steal whatever goods a trader has.
C.Damaged roads could be repaired or replaced.
D.Losing animals and livestock would be a big blow to the economy because they provide the food we need.