How did the separate of kingdoms of egypt unite? ?

At this time the capitol of Upper Egypt was known a Nekhen while the capitol of Lower Egypt was Nekheb later called Heiroconopolis (the falcon city). 
After many years of warfare it was the warrior-king Menes (c3000BCE) whose armies finally defeated the armies of the southern nomes or city states, that are collectively known to us as Upper Egypt. 
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The majority of both parties voted in favor of the bill all senate republicans voted in favor of the bill