How were the people of ancient rome able to change their government?

when the byzatine empire split into two parts they eastern half turned into greek and the other half was roman.

2686-2181 bce-- "egyptian civilization developed along the nile river in large part because the river’s annual flooding ensured reliable, rich soil for growing crops."

1069-664 bce-- "ancient egyptians developed wide-reaching trade networks along the nile, in the red sea, and in the near east."