How did King Menes change ancient Egypt?

He had united Egypt

Explanation:

Menes (c. 3150 BCE) is the legendary first king of Egypt who is thought to have united Upper and Lower Egypt through conquest and founded both the First Dynasty and the great city of Memphis. He is credited with uniting Egypt into one peaceful kingdom, he was able to unite lower and upper Egypt into one single unified country, through a massive battle across Egypt. A lot of information about him, his era and gods like Hathor and Horus, was known through “Narmer” palette which was discovered in 1988.

King Menes is the one who United Upper and Lower Egypt through conquest. And known as the founder of the First Dynasty. Also Built he city of Memphis, a Greek rendering of the Egyptian Men, meaning "The Well-Established," was built on the site of an earlier stronghold of the Upper or "White" Kingdom known as White Wall. It was strategically located in the center of the unified kingdom, a few miles south of modern Cairo on the west side of the Nile. With the Upper and Lower Kingdoms continuing to stabilize as a single culture, the Memphites took advantage of the security of the capital and the farming conditions there to amass an unprecedentedly large surplus of food.

Explanation:

i would go with the last one