Final answer:
Scholars believe that the first pharaoh to unite all of Egypt was Narmer, also known as Menes, in 3150 BCE.
Step-by-step explanation:
Scholars believe that the first pharaoh to unite all of Egypt was Narmer, also known as Menes. There is evidence that suggests both names refer to the same person. This major political and cultural shift occurred in about 3150 BCE when Upper and Lower Egypt were unified into a single powerful kingdom.