Lyric discussion by Blue_Man 

Yep, the meridian of 100 degrees west runs pretty much smack through the middle (north-south) iof the Dakotas, Nebraska, and Kansas, nips off the corner of Oklahoma then runs on down through Texas just west of San Antonio and is quite literally "where the Great Plains begin".

On the surface, this song looks like an evocative indictment of the rural American midwest. I can see how you'd go from that to drawing a parallel between the desolate nature of the landscape and the desolate nature of the culture, but I'm not totally convinced that's the intent.

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