Why do people think Cleopatra was black?

Wikimedia Commons,CC BY-SA 4.0(cropped). By George M. Hollenback In the trailer for the disastrous Netflix documentary Some of the Cleopatra-was-black business …
Liam Ronan
Personally I blame the American comedian, Steve Martin, who released a song called "KIng Tut" (1978) and called Tut his (Martin's) favorite 'honky'. King Tut - SNL
John A Cassani
Cleopatra’s mother was probably her aunt also, as the Ptolemies retained that particular Egyptian royal tradition. Cleopatra is said to have been the only one of the Greek Pharaohs to have mastered the Egyptian language.