"Only one meaningful correlation emerged. Other things being equal, insurgents were much more likely to come from a county where the white share of the population was in decline. For every one-point drop in a county’s percentage of non-Hispanic whites from 2015 to 2019, the likelihood of an insurgent hailing from that county increased by 25 percent. This was a strong link, and it held up in every state." A well-reported, frankly terrifying story.