Oh really, Mr. Mann? Didn't you ever learn that Washington, D.C. was designed by an African-American? Or that a major inspiration for the U.S. constitution was the Iroquois Great Law of Peace? Or that it was a Mexican who invented Color TV?
Wonder how many of those inventions we would have if people in Asia hadn't' discovered the zero?
Really hard to have a technological civilization without modern math.
As for Sanger, I have always found people trying to discredit her by bringing up that she believed in eugenics kind of ironic since they keep leaving out that Sanger was also against abortion.
SO planned Parenthood was so obsessed with one small part of Sanger's beliefs that they ignored another of her core beliefs? Really?