All modern humans are related to what scientists call "Mitochondrial Eve." This refers to our common matrilineal ancestor. She lived approximately 200,000 years ago and depending on how you estimate the length of a generation, we are only 5,000 to 10,000 generations from one another. To put it another way, each of us is a cousin of one another at most 10,000 times removed. And yes, Mitochondrial Eve lived in Africa, so, in a very real way, we are all Africans.