Answer:
The so-called Intermediate periods, which were characterized by civil unrests and invasion of foreigners.
Step-by-step explanation:
Egyptian society was frequently weakened by corruption and abuses. Because of that at the end of the period known as Old Kingdom country was plagued by civil unrests and wars.
Also, after the period of Middle Kingdom country was invaded by Hyksos, who were ruling in the country until the period when New Kingdom was established.