Analysis of information sources in references of the Wikipedia article "B. H. Roberts" in English language version.
[T]he south is entirely right in thus keeping open at all times, at all hazards, and at all sacrifices an impassible [sic] social chasm between black and white. This she must do in behalf of her blood, her essence, of the stock of her Caucasian race ... As a race, the Southern Caucasian would be irrevocably doomed. ... No other conceivable disaster that might befall the South could, for an instant, compare with such miscegenation within her borders. ... But some may deny that the mongrelization of the Southern people would offend the race notion ... That the negro is markedly inferior to the Caucasian is proved both craniologically and by six thousand years of planet-wide experimentation; and that the commingling of inferior with superior must lower the higher is just as certain as that the half-sum of two and six is only four ....
The patriots of a hundred years ago are being overrun by the Polish Jews, and Italians, and Irish peasants who are flocking to America in droves ... If we are but true to ourselves, we have the very factors, geographically, spiritually, and socially, that shall perpetuate our race, and lift us up as a beacon light of civilization when all other parts of our great country have gone into the folly of race disintegration and given their birthright into the hands of undesirable foreigners.