Fred Kniffen's map of folk-housing regions does not show the eastward diffusion of a housing style that can be found almost everywhere today. It is the

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Fred Kniffen's map of folk-housing regions was developed in the 1960s, before the widespread popularity of ranch-style houses. Ranch-style houses are characterized by their long, low profile and open floor plan, and were popularized in the mid-20th century in the western United States before spreading across the country. Therefore, they are not depicted on Kniffen's map, which focuses on traditional regional housing styles.

Fred Kniffen's Map of Folk-Housing Regions Does Not Show the Eastward