If Nationalism is Racial Code Word Then Why Aren’t Blacks Fleeing Elsewhere or Changing the Constitution to Make It Fair?

Leftists love to say that nationalism (where the U. S. is concerned) means pursuit of a white nation, yet blacks have all the opportunities of whites and browns, proven by their great successes in all fields of endeavor, and if love of the U. S. Constitution is really racist, then why aren’t blacks  pointing out the supposedly racist portions of it?