I do not think it is possible to pinpoint just where our ancestors came from. Africa just happened to have large dryer areas that preserved the bones better.
It could also be that aliens would drop off their pets on various continents and leave them here on earth and they became us.... : )
That too. There’s a great old sci-fi story called Inherit the Stars where man has assured himself of evolution and scientific development... until they discover an ancient astronaut’s body on the moon from 50,000 years past...
Africa just happened to have large dryer areas that preserved the bones better.
/bingo