This Demmers Cartogram shows the US prison population in each state by year, since 1978. The size of each state indicates the number of prisoners, and darker hues are assocated with increased rates of incarceration. The data come from the Bureau of Justice Statistics, and are available at www.icpsr.umich.edu/icpsrweb/NACJD/studies/36657. Thanks to Chris Given, who created and shared the cartogram b.lock that I modified to make this visualization.