I finally got around to making these. Here's 1920. It's presently without Oklahoma, Missouri, Louisiana, Kentucky, Tennessee, and North Carolina; I'll be updating it until it's finished. Here's 1936; it's missing Arkansas and Kentucky, but again, it will get updated.
While we're at it, here's 1924 (missing Iowa and Kentucky), 1928 (missing Tennessee and Virginia), and 1932 (missing Kentucky).
Incredible! Harding won almost every non-confederate county in the country.
Roosevelt looks like he did even better. Why did he do so comparatively poorly in his native New York and the Northeast in general? Was the New Deal particularly unpopular there?
Did any of the two win more counties than Nixon in 1972? 1936 must have been the greatest landslide in history.