How did the white people get in Africa?

Humans are believed to have originated in Africa, so there were Africans before there were European or Asiatic whites there.

The first group of white people believed to have entered Africa are the Phoenicians from Asia Minor around 7th-8th millennium B.C.

Later white invaders included Ancient Romans who conquered what we call Tunisia today and Ancient Greeks also settled parts of Northern Africa (e g Alexandria of Egypt was found by Alexander the Great)