There have been hundreds of pyramids discovered, and many believe there are more buried beneath the sands.
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Lower Egypt and Upper Egypt were united together by Pharaoh Menes in 3100bc. Hope that's helped.Was accomplished by king Menes.
Narmer was the ruler of upper Egypt.
3100 B.C.E
Egypt needed Nubia to fight of the invaders
Menes (also called Narmer) was the first pharaoh of Egypt. After he has conquered Upper Egypt and Lower Egypt, he combined the red crown and the white crown together as a symbol of his rule of Egypt as one kingdom.
It was Piye.
Kush and Egypt traded with each other
The White Crown of Egypt represented the Pharaoh ruling Upper (southern) Egypt. The Red Crown of Egypt represented the Pharaoh ruling Lower (northern) Egypt. Together these crowns meant that the Pharaoh had united both Kingdoms and ruled them both. When put together they formed a general shape of Egypt.
Narmer was the ruler of upper Egypt.
Egypt needed Nubian help to fight off invaders.
Upper and lower Egypt came together when Nile flood dint com go on google it will give a better answer