This video shows how each state has voted in presidential elections since 1916. Below that I have the original data source and I link to the Tableau workbook used in this video.
The data for this visualization came from reddit user u/e8odie, who created a chart of the outcome of each election since 1916. When I saw his chart I wanted to throw it in Tableau so I could see it on a map over time.
If you want to play with an interactive version of the Tableau map, or download the Tableau workbook for yourself, check it out here.