In the united states, the one-drop rule lumped together anyone with any amount of "black blood" into one category, setting up an essentially binary racial system of black and white with little thought for other minorities, such as asians or native americans. under apartheid in south africa, on the other hand, there were four racial categories; and in brazil there are up to a dozen racial categories, depending on whom you ask. what conclusion can we draw from these differences in racial categories