Voting America consists of a series of animated and interactive maps (with commentary) visualising how Americans have used their votes since 1840.
Voting America examines the evolution of presidential politics in the United States across the span of American history. The project offers a wide spectrum of cinematic visualizations of how Americans voted in the presidential election at the county level, from the beginning of the American party system though the modern day. Here you can see historical developments in American voting patterns as they moved across the landscape of the United States.
via MeFi