The difficulties they struggled with was the Bubonic plague also known as the Black Death caused by bacterium yersinia pestis and civil war.
Answer:
nobility, clergy, peasantry,
Explanation:
i'm not 100% sure i just searched it up
1st. never accept anything as true until proven true
2nd. divide each difficulty encountered into smaller pieces to help solve
3rd. think in orderly fashion
4th. always make enumerations complete and reviews general