I honestly am really surprised by your question. Obviously it was done intentionally based on the status of black and white lives at the time. But it does seem implied to some degree based on our status of races today. But I wouldn't exactly say it was an oversight. If I had to make an answer right off the top of my head I would say it would be in between Intentional and it being implied. But it would be closer to intentional in my opinion.
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(Thats my timeline)