Due to modern transportation, travel, the internet, and stratification that didn't exist generations ago, smart men find smart women and have smarter children.
On the opposite end of the scale, the ignorant are breeding with the ignorant on the taxpayer dime like never before seen, and having even more ignorant offspring.
“smart men find smart women and have smarter children”
Well—sort of....
There is a reversion to the mean, particularly after a couple of generations.
In addition by the third generation the trust fund grand-kids become useless—they don’t have the talent to match up to their parents and grand-parents and they often turn to alcohol and drugs (or leftist political “activism”) out of frustration at their failure to “measure up”...
That said—stupid people breeding and producing lots of stupid children is a great way to bring civilization to its knees.
The old way was the best way—smart men married beautiful “home-maker” women—who raised lots of kids—and made up for her average IQ with her love for her kids and determination to have her kids succeed.