This visualization shows the geographic expansion of Walmart stores across the United States from 1962 to 2006. An animated slider scrubs through years, revealing store locations as points on a map of US states, alongside a running cumulative count displayed as a filled area chart. The map uses the `d3.geo` Albers projection and renders SVG paths from TopoJSON data, while the slider and area chart are built with `d3.svg.brush` and `d3.svg.area`. The play button triggers the animation, which is driven by a queue of data loading operations.