are beyonce's parents white?
Both of them? Are you suggesting that she's adopted? Even the most radical social constructionist about race is going to admit that biology and genetics have something to do with race.
why Jesus was circumcised
What, were you expecting an angel to tell Joseph or Mary that circumcision wouldn't be the mark of the new covenant that Jesus would later initiate?
chief justice taney blacks aren't people
Whatever objectionable things Taney might have said, that is most certainly not one of them. He refers to black people as "black people". Pay close attention to the second word in that phrase.