Since the 1800s, white people's Intelligence has actually gone down. (Pic. 1)
What a potential confound here is intraracial dysgenics.
Basically, we used to utilize eugenics by killing the criminal segment, basically the low IQ portion, of our population. (Pic.2)
Maybe we should 1. Eliminate the 8th amendment and 2. Utilize the electric chair more.
You know, if you care about the intelligence and prosperity of our race's future? (I'm going to start getting less table/graph driven and getting more conceptual and shit. It's a little more fun)
As always, DM me for sources (both of these pictures are from peer-reviewed, academic journal sources)