Here is what Forensic Anthropology says about the subject:
The physical traits of Caucasoid crania are still recognized as distinct (in contrast to Mongoloid and Negroid races) within modern forensic anthropology. A Caucasoid skull is identified, with an accuracy of up to 95%, by the following features:
Little or no prognathism exhibited—an orthognathic profile, with minimal protrusion of the lower face.
Retreating zygomatic bones (cheekbones), making the face look more "pointed".
Narrow nasal aperture, with a tear-shaped nasal cavity.
Other physical characteristics of Caucasoids include hair texture that varies from straight to curly,with wavy (cymotrichous) hair most typical on average according to Coon (1962), in contrast to the Negroid and Mongoloid races. Individual hairs are also rarely as sparsely distributed and coarse as found in Mongoloids.
Skin color among Caucasoids ranges greatly from pale, reddish-white, olive, through to dark brown tones.
This is why, even though the experts in Serology are adamant that 'there is just one race - the human race' based on analysis of blood (though recently Neanderthal DNA was found in Caucasoid and Mongoloid people - but not in Negroid people - so technically even our DNA does have differences). The experts in Forensic Anthropology are equally adamant that they can determine which of the 3 main racial categories a person belonged to - based on their skull shape...and they are 95% accurate with this, so they too have a valid point to make.
Personally I like to compare Homo Sapiens to DOGS, sure every dog is 'Canis canis' (and can successfully interbreed) like every Human is 'Homo sapien' (and can successfully interbreed) - every dog and every human OBVIOUSLY does not look the same....so we are all humans but of different 'breeds' (for lack of a better word) - just as an Alsatian is NOT a Chihuahua (A Mongoloid is clearly not a Caucasoid who is likewise clearly not a Negroid) - yet they are both dogs indeed....and all dogs (like all humans) can trace back to roughly the same remote ancestor far enough back in time...what is the problem seeing the issue this way?
My 'breed' is my ancestral tribe - or combination of tribes...and your 'breed' is your ancestral tribe - or combination of tribes. Same basic principle with Dogs - we just use fancier words to describe ourselves than we do not use on 'lower' animals.