What do the historians call the time period that occurred right after the old kingdom?

The time period that occurred right after the Old Kingdom in ancient Egypt is known as the First Intermediate Period. This era, spanning approximately from 2181 to 2055 BCE, was characterized by political fragmentation, a decline in centralized power, and a struggle for control among various regional leaders. It followed the collapse of the Old Kingdom, which had been marked by strong centralized rule and monumental construction projects. The First Intermediate Period eventually gave way to the Middle Kingdom, a time of reunification and cultural revival.