This interactive stacked area chart visualizes the number of remaining premises to be geocoded across eight U.S. states from 1880 to 2000, with each state represented by a filled area in the stack. The visualization uses the D3.js library (version 4) with a `d3.stack` operation to compute the cumulative state values from the CSV data. Users can brush horizontally along the x-axis to zoom into a specific time period, which triggers a smooth `transition` animation that re-scales the axis and areas. Hovering over a state’s legend rectangle dims all other areas, allowing for focused inspection of a single state’s trend.