If that were true before modern times, distinctions in appearance never could have developed.

Edit as reply because "pOsTiNg tOo FaSt":

> Before modern times there was enough mixing to keep speciation from occurring but not enough to fully homogenize.

I see. Is there some quantitative genetic similarity measure, by which it was determined that it was worth categorizing foxes and wolves and bears into distinct subspecies/breeds/whatever taxonomical categories, but not humans? I assume that's what your "speciation did not occur [enough to merit taxonomical distinction]" is based on.

I.e. by what measure are a Pygmy and a Norwegian more similar than a Sumatran and a Siberian tiger [1]?

[1] https://news.ycombinator.com/item?id=47812581

It’s not binary. Before modern times there was enough mixing to keep speciation from occurring but not enough to fully homogenize.

If our modern world continues for thousands of years eventually our differences will start to dissolve.