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Most biographical sketches of Mrs. Pleasant oft remark that she self-identified as a black/colored person after the Emancipation Proclamation was signed in January 1863. A few even cite her going to San Francisco’s City Hall to do so where an elaborate reading of the document took place. This claim appears to date back the Holdredge book.
A few things call this conclusion into question. As noted in this post, Mrs, Pleasant’s niece, Caroline F Park, was murdered in early December 1860. The funeral and visitation was published in the Daily Alta specifically mentioning the girl as the niece of Mrs. Pleasant. The crime itself was widely covered across the state, as was the girl’s race. It is easy to conclude then that the modest sized San Francisco community (just over 56,000) and beyond knew of Mrs. Pleasant’s ethnicity prior to 1863.
A second element to consider is the 1860 Federal Census (data collected June of the same year). In the household of Selim F. Woodworth we find Ellen Pleasant, age 40, a female identified as “B”. John Pleasant is separately identified as “M”. The niece, Caroline F Park, age 16, is also listed as “M” for mulatto. In June 1860 and again in December, Mrs. Pleasant’s ethnicity is recorded. It is interesting that she was recorded as “B” versus “M” as she had claimed to be able to pass as white. The 1860 guidance to census takers directed–“In all cases where the person is white leave the space blank; in all cases where the person is black without admixture insert the letter ‘B’; if a mulatto, or of mixed blood, write ‘M’.” Thus the racial determination was made by the data collector who was assumed to know the community. Racial self-identification did not occur for another century in 1960 and the beginning of mail out census documents.

The reason Mrs. Smith, as she was then known in San Francisco, might’ve striven to pass was due to the fact that in 1852, California enacted legislation permitting the arrest of escaped slaves (the Fugitive Slave Act). Then in 1858, the California State Legislature passed a bill outright banning Black Americans from immigrating to the state — though it was never formally enacted into law. This is just when MEP left California for her meeting with John Brown in Chatham, Ontario.