Anyone who thinks Austin is more culturally aligned with Indianapolis than San Antonio is a maniac.

I noticed that recent research showed that South Dakota has a high level of dark triad characteristics:

https://www.newsweek.com/psychology-psychopaths-dark-triad-m...

and my first though is "What's different about South Dakota and North Dakota" and got told by a friend who's a geography nerd that much of South Dakota is really weird and isolated and different from other states.

Same for Minneapolis, Boston, and Des Moines.

Agreed. What the western parts of this map avoids is that the cultures are a mix of mostly descendent European cultures (Norwegian, Irish, German, etc.) and Hispanic cultures especially in the south differs strongly once you go north of Colorado.