How did colonization play a role in the expansion of slavery?

Ineed on 2-4 i want y’all to reply to this question so i can turn this into my teacher tomorrow

Read the excerpt from the history of herodotus, book 2. egypt . . is an acquired country, the gift of the river. this quotation from herodotus, a greek who traveled in egypt, is about how the nile river enabled ancient egyptian civilization to develop and succeed. what specifically was the river’s gift? fertile soil fishing stocks defensive capabilities drinking water

Who founded the social contract theory of the government