For or Against . . .

I see that you're trying to provide an answer to my proposition by
way of analogy, but the linkage of prehistoric Africa escapes me.
Would you care to elaborate your argument?

> Why? Because we came from Africa and the first groups which left
were much
> smaller than 250,000. In fact there probably were not 250,000
humans when
> the first successful groups left.
>
> Why?
>
> > If the requirement for 250,000 people had been imposed on
previous
> > colonization efforts, we would all still live in Africa. This
> requirement
> > is unrealistic, unhistorical, and would make future
colonization's