Two bird populations living in the same locale but divided by a mountain range therefore not naturally breeding with each other would classify as a different species, even if they could breed with each other.
So your question is hard to answer.
It’s not quite all across the globe but pretty close, and is so adapted that it is not considered invasive any more in most places.
I look at a sumatran tiger and a Siberian tiger and I see a lot less variance than I see when I look at a pygmy, a Norwegian, an sentinel islander, and a han Chinese person
No. Multiple human subspecies did once exist (examples being Neanderthals, Denisovans, Homo Erectus, and Homo Floresiensis) but only our species, Homo Sapiens, remains (with traces of Neanderthal DNA so there was some interbreeding.) However race is a cultural and social construct. Different human races are not different human subspecies. A Pygmy, a Norwegian, a Sentinel Islander, and a Han Chinese person are all the same species. The superficial variations in average height, skin color, etc. do not vary enough to constitute species differentiation - humans share 99.9% of their DNA, and the vast majority of genetic variation exists within populations (in other words, within "races") and not between them.
The generous idea is that "subspecies" does not provide an anthropologist a useful lens to look at humanity, therefore we do not classify.
The alternative is that "subspecies" is too close to "race" for scientists, publishers, and funding bodies to touch, so its deliberately ignored.
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]?
If our modern world continues for thousands of years eventually our differences will start to dissolve.
I mean people won't like the idea but that's not my point; what you describe variety in superficial traits while maintaining common traits
Applied to humans; skin color, eyes, dwarfism, hypertrichosis... can still interbreed
When it comes to categorization and taxonomy in leaky abstractions like languages the boundaries get a bit hand wavy and usually land on whatever fits the prevailing social desirability bias of the day
The same selection pressures that produced the variety of "superficial" traits also act on "non-superficial" traits - nature does not recognize this distinction.
What is a subspecies and species is random gibberish of the living humans