[AnotherUnixGeek]

What the hell happened to US-born white guys since the 60’s / 70’s when white players were still a majority in the NBA ?

They lost interest in the game, I assume, same as US-born black guys losing interest in baseball. Even as late as the '80s, I remember plenty of American black players in the majors. There are still a few - Josh Bell, Mookie Betts - but they're the exception rather than the rule.

[sushiman]

There are over 60 foreign baseball players playing for Japanese pro teams and over half are black . Not all are Americans , though . Of the white guys playing virtually all are pitchers . There are some Taiwanese players as well .