Just a friendly reminder, the IQ system is dated and extremely ableist, scoring a anything on a IQ test means nothing on someone intelligence because smarts comes in so much incredibly different ways that no test can be accurate of how smart someone is.
Overlaying this with daily lead exposure would be interesting
Edit: Also, I'm not sure I'd place much stock into IQ tests - just like "brain training" it seems more a measure of how well you can take an IQ test, not some magical empirical measure of how intelligent you are.
I find it mildly interesting that despite all of the perceived differences in intelligence, and the scary colors of the chart, every single state is between 94.2 and 104.3. IOW, there is no meaningful difference in IQ at the state level.
I'm unironically amazed that Texas is supposedly perfectly average while California is below average. I bet it's all the Texas engineers offsetting the Texas bigots, while the California techbros offset the California tech geniuses.
This is actually a regional bit of language, specifically the region of the US. The term 'state' originally meant (and in some places, still means) an independent and sovereign entity/government. Under the terms of colonial America, each state was truly independent, so the term makes complete sense. Even the original attempt at uniting the colonies (under the Articles of Confederation) maintained that independence.
But that failed and was promptly replaced by the US Constitution, which made the states much more like provinces. They became a piece of the whole, with significant influence from the larger entity. But we kept the term "state" when referring to them.