@bcham I believe this association was first observed by a geologist, Steven Dutch, University of Wisconsin - Green Bay, following the 2000 election: https://stevedutch.net/research/elec2000/geolelec2000.htm

It was popularised by https://deepseanews.com/2012/06/how-presidential-elections-are-impacted-by-a-100-million-year-old-coastline/

Ryan Starkey's version is at https://starkeycomics.com/2021/06/11/how-a-coastline-100-million-years-ago-influences-modern-election-results-in-alabama/