RSSMy bet is on Jim Snow being the closest. Recent IQ papers (e.g. by Woodley of Menie) indicate that dysgenic breeding and mass immigration are lowering Western IQ levels by about 1/2 to 1 point per decade and have been since at least the 1800s, and, I surmise and other data tend to show, along with that decline, average general genetic quality has been deteriorating (the two things are the same genes to a large extent). So Whites are already noticeably going out with an increasingly pathetic, insane, woke whimper, not a Jim Crow bang, nor is there any chance of a meritocratic ‘Murraytopia’ as there are fewer and fewer people able to understand its benefits for all.
The only other likely possibility I can see is commercialised human genetic enhancement (of many kinds), if and when the tech gets good enough.
Well said, good analysis there.