Answer:
Decline in trade, People gained opportunities for social class mobility and Wars broke out
Explanation:
The massive decline in trade was due to so many people dying from this illness which caused demand to reduce.
The lower clsss gained opportunities, since many died it was difficult to find field hands/laborers which used to be in abundance, now the workers gained bargaining for higher wages.
And wars stared to break out most notably the 100 years war between multiple kingdoms trying to fight for the right to rule over France
