This interactive stacked bar chart displays the distribution of three categories across U.S. states for a selected year, with a dropdown menu to switch between years. The visualization uses D3.js v5’s `d3.csv` to load data, `d3.scaleBand` and `d3.scaleLinear` for axes, and `d3.stack()` to compute stacked segments. Animated transitions (via `transition().duration()`) smoothly update bar heights and axis labels. Total values for each state are shown above the bars. The SVG rendering includes axis groups and colored layers, with the year selector populated from the dataset.