WE ARE ALL AFRICAN! - er, not sure about this.
Homo sapiens evolved in Africa, so my ancestors were African, if you go back tens of thousands of years.
But, different races of humans have evolved since then, largely in isolation.
I'm European. I live in England, a northern European country and natural home for people like me. Northern Europeans evolved in Europe.
Chinese people evolved in Asia.
Sub-Saharan Africans evolved in sub-Saharan Africa.
Some whites live in Australia, America and Africa because of European technology - ocean-going ships, etc.
Some black people live in the Caribbean and North America, also due to European technology - ocean-going ships, etc. It's not nice to say but David Starkey was correct: if it wasn't for slavery, there'd be no blacks in the Americas.
The races do differ in some aspects, e.g. Chinese people cannot digest milk because as adults, they don't produce the enzyme lactase. Other people - whites, blacks, Arabs, Jews - can and do drink milk.
It's not being intellectually honest to insist everyone alive to day are Africans.