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Originally Posted by Peremensoe

Real progress has been made on this question, and it has been damned important to a lot of people--for example, the (not quite completed) abolition of slavery is predicated on the recognition that slavery is incompatible with human rights, and that all the categories of humans once relegated to slavery are people fully deserving of those rights.

I disagree. Here's how:

What is it specifically about the abolition of slavery that restored personhood to those groups?

I'd call it dramatic social, cultural, and political progress. Progress towards a grand unified theory of personhood? Not even close.