Burroughs and racism
Pretty good study of Burroughs' views about races as seen in his books. For anyone who bothers to read it through.
At least read the excerpts from the books. He was a man of his time and far from perfect in his views, when those views are seen with modern eyes, but for his time he was downright progressive. He used the racial stereotypes of the time when they fit the story he wanted to tell, but he did not argue that every member of a race was the same, or automatically inferior or superior due just to their race, which, as far as I understand, was not exactly a common view in the early years of 20th century.
And more than once he skirted the idea of marriage between people of different races. Now he did not actually write it very often - if you disregard the Mars series where the marriages are between earth men and red skinned oviparous martian women - but he was writing in order to get paid, not to push an agenda, and at that time crossing that line might have cost him sales. So the Arab girl turned out to be an abducted or adopted European one, and the Apache a white man who had only been raised by the Apaches. But always only after the white part of the couple first had to realize and accept the fact that they truly loved the person they thought was not white.
http://thetarzanfiles.com/2016/07/08/edgar-rice-burroughs-was-not-a-racist-hack/