I think many people use the word "race" rather loosely. Historically this was also done, for example, Greeks, Italians and Jєωs (as well as the British and Germans!) were once referred to as "races" (when what was really meant was "ethnicity".)
Race is far more than skin color; otherwise white people who get suntans would become a different race.
Scientific studies, esp. before the dawn of political correctness, illustrated very clearly that races are more than just skin color. In fact biracial people often have trouble getting bone marrow transplants because the matches run strictly along racial lines....and the more unusual your racial mix, the less likely you will find a match in time. So too much racial mixing can also prove fatal to the children. See:
http://www.physorg.com/news162659550.htmlRace properly defined is: "A family, tribe, people, or nation belonging to the same stock". Which is also why there is no such thing, scientifically, as a "human race".
A good set of books to read on this subject are:
"Why Race Matters" by Dr Michael Levin, Ph.D
"Race, Evolution and Behavior" by Dr J. Phjilippe Rushton, Ph.D
(Both available from Amazon.com)