<i>There is no scientific definition of race.</i> People do differ genetically and sometimes those differences can be found in certain ancestral groups, but there is no scientific way to draw hard lines between those groups.<p>What is someone who is 1&#x2F;4 African, 1&#x2F;4 European, and 1&#x2F;2 Vietnamese? What does their &quot;race&quot; tell you about them?<p>Even if you could do a genetic test of every single person who, say, applied for a job or a college, you <i>still</i> wouldn&#x27;t be able to determine their race with any certainty most of the time.<p>Race is just not an objective definition, and if you knew anything about US history, you&#x27;d know that. Most of the landmark civil rights cases were about proving that you can&#x27;t identify race by appearance, behavior, or even ancestry, since so many blacks had mixed ancestry.