Growth of Wal-mart across America

There is a great visualization of the spread of Wal-mart stores across America at FlowingData. The visualization starts with the first Arkansas store in 1962 and plots the sprouting of additional locations all the way up to 3176 stores in 2006. The data for the visualization can be found here, researched for the paper “Diffusion of Wal-Mart and Economies of Density”.