How did the unification of upper and lower egypt allow for the establishment of a strong government

There are very few surviving records from the Archaic period, the era before the unification of Egypt, so there is actually very little about this that we know for certain. However, according to most accounts, the unification of the two kingdoms occurred in the early third millennium BCE when the king of Upper Egypt invaded and conquered the kingdom of Lower Egypt. Again, the traditional date for this is 2686 BCE, although there is some disagreement on the exact year.

Nevertheless, it's apparent that these two kingdoms were unified under a single king, who took the title of pharaoh. Archaeologically, some of the evidence of unification comes from the mixing of the traditions of each kingdom. The pharaohs of the united Egypt wore a double crown that combined the red and white crowns of Upper and Lower Egypt into one. Religious traditions also mixed, leading to changing ideas about the gods. Most notably, all the people of unified Egypt starting worshipping the pharaoh as an incarnation of the hawk-god Horus, making Horus the first national deity to be fully embraced by both kingdoms together.