My favorite way to illustrate the arbitrary nature of race is to ask what the race is of our current (alas, soon to be former) president. Typically the answer is "black." Yet his mother was "white." If it were genetic, we'd say he was mixed, but we're still operating under the influence of old arbitrary rules where having just a small amount of black ancestry makes you "black."
There is actually a more appropriate term - 'mulatto' which was specifically created to describe people born to black / white parents. Today it's considered 'dated and offensive', so we don't have a 'polite' and 'correct' way to describe the ethnicity of our (current) President.
Would you deny the existence of dog breeds because there exist labradoodles or any other mixes?
https://en.wikipedia.org/wiki/One-drop_rule
https://en.wikipedia.org/wiki/Hypodescent#Hypo.2Fhyperdescen...
The idea that a mixed-race person is considered to be a member of only one of their parents' races long predates people's unwillingness to use "mulatto."
And the idea that people must call him "black" because they're not allowed to say "mulatto" is absurd. "Mixed" would describe it without causing any offense, as would "half white, half black."
I remain amazed at how insistent some people are that the lingering consequences of centuries of racial injustice in this country are somehow caused by "political correctness" in the past few decades.
'Residents of Spain, Latin America, the Caribbean, and some countries in Africa freely use the term mulatto, or its cognates in other languages, usually without any suggestion of insult'
If you could propose a more PC term than mulatto (which specifically describes someone with white/black parents), I'd take it - but I don't think there is any.
From: http://www.arogundade.com/is-barack-obama-black-or-mixed-rac...
Barack Obama's ... was born on August 4, 1961 in Honolulu, Hawaii. His parents were of contrasting ethnic backgrounds. His mother, the late Stanley Ann Dunham, was born in Wichita, Kansas. She was an American of English and Irish ancestry. Obama’s father, the late Barack Obama Sr., was born in Kenya’s Nyanza Province. He was of African heritage, belonging to an ethnic group called the Luo. They make up Kenya’s third largest ethnic group, with other members scattered across eastern Uganda and northern Tanzania.