It is simply a matter of what period of time in history.

National Geographic is undertaking a huge project to map all of our migrations
National Geographic: The Genographic Project
https://www3.nationalgeographic.com/genographic/

I have been lucky to be able to trace my path from where I was born in Indiana back to Ireland in 1650 prior to that Scotland back to 1300 and prior to that back to Ireland. I have a Celtic Haplotype which we can say that my ancestors were in western europe and then tracing back to the origins of man. Depending on your beliefs that was the garden of eden or that tree the first monkey climbed down from and decided to walk upright. Some might think my Hoosier hertigage has taken me a step closer back to that tree but I prefer to call myself of Scottish heritage who now resides in the Pacific NW of the US. I don't deny those other locations of my ancestors it is just a preference.