Abolitionism and eugenics in R. Elia Benamozegh's exposition of Gen. 9:25

Here is a very interesting comment, to say the least, in the commentary Em Lemasores of R. Elia Benamozegh (1822-1900). He says, commenting on Gen.9:25 ("Cursed be Canaan; a servant of servants shall he be unto his brethren.") that the Anti-abolitionists of England (he calls them אוהבי השעבוד Non abolizionisti באנגלאטירא, so he renders it as "lovers of slavery" in Hebrew) contend that black slaves aren't entirely human, but are partially descended from apes, specifically orangutans. The proof they bring is the size of their skull, which they say is smaller than all other men, and consequently their brain is smaller and similar to an ape's. But one should see the scholar Tiedmann who wrote a special book refuting this.

Now, I have to say that I doubt that he meant England, which already abolished slavery long before. As I noted here well into the 19th century some European Jews didn't seem to fully grasp, or care, that the United States wasn't English. I know that he says Angleterre, but it really only makes sense if he means the United States of America. If so, here would be another example of an inability to distinguish between the mother and the child, fully 85 years after the Declaration of Independence.