No obvious explanation comes to mind for this remarkable correlation in Google Ngrams of “New Mexico” and “Arizona”. I checked a bunch of other neighboring states in various combinations, and nothing comes close. Anyone?
jfleck at inkstain
A few thoughts from John Fleck, a writer of journalism and other things, living in New Mexico
Many people are geography-challenged,but might know there are few states between Texas and California, somewhere.
Kansas and Missouri don’t get their act together until about 1915, but after that they have very similar values.
Kentucky and Tennessee are pretty close, too, except for something strange going on in the 1920’s around the use of Kentucky.
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Books on the SW? Equal number of books on both states? Depends on the weather?