Isarithmic History of the Two-Party Presidential Vote

Using county-level data, I spatially and temporally interpolated presidential vote returns for the two major party candidates in each election from 1920-2008. The result illuminates the sometimes gradual, sometimes rapid change in the geographic basis of presidential partisanship.

A detailed description can be found here.

Isarithmic History of the Two-Party Presidential Vote from d sparks on Vimeo.

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