Final answer:
The Middle Kingdom was a time in ancient Egyptian history when Egypt controlled Nubia and built forts to protect trade, but it did not see the construction of the first pyramids or the practice of a monotheistic religion.
Step-by-step explanation:
The Middle Kingdom was a period in ancient Egyptian history, specifically from around 2030 to 1640 B.C.E. during the 11th to 13th dynasties. During this time, the Egyptians controlled Nubia, a region to the south in present-day Sudan, and built a series of forts and garrisons to protect trade and extract resources. However, the Middle Kingdom did not see the construction of the first pyramids or the practice of a monotheistic religion.