I saw a reference to a rather detestable HP Lovecraft poem, On the Creation of Niggers, but unfortunately the only extant verses I could find were slightly incorrect versions on Nazi sites like stormfront.org. I used Amazon’s “search inside the book” to get this from The Ancient Track: The Complete Poetical Works of H. P. Lovecraft.
When, long ago, the gods created Earth
In Jove’s fair image Man was shap’d at birth.
The beasts for lesser parts were next design’d;
Yet were they too remote from humankind.
To fill this gap, and join the rest to Man,
Th’ Olympian host conceiv’d a clever plan.
A beast they wrought, in semi-human figure,
Fill’d it with vice, and call’d the thing a NIGGER.