Emil O W Kirkegaard

I wonder if there are any big datasets longitudinally tracking how these most recent mixed-race adoptions are turning out?

There are some big longitudinal datasets that have outcomes for these, yes. Fuerst dug up some of them, but no one seems to be interested enough in getting them and having a look. Thousands of nonwhites are adopted into white homes a year, so there will be a lot of data somewhere

Assuming anyone tracks them. Just because there are millions of adoptions doesn't mean there's usable records etc. It's entirely possible there's nothing usable. Kind of the way MZA studies have almost stopped entirely because MZ twins are no longer placed separately.