Historical racism, slurs in link
Evidently Sojourner Truth's best known speech was mangled by a fake transcription done by a white feminist. You can compare the real speech with the mis-transcribed one here. It inserted an accent Truth did not have and used slurs she did not use either.
Historical racism
The correct rendering of the speech comes from a reporter named Marius Robinson who was friends with Truth and contributed to abolitionist newspapers. He went over his transcription with Truth herself, who lent her approval. The false one was written more than a decade later.
Something I find amazing about Truth's speech is it was extemporaneous.