This chart displays population distributions for six U.S. states, broken down into seven age groups. A grouped bar chart, it uses horizontal positioning for states and color-coded bars for each age bracket, with a legend on the right. The visualization loads CSV data via `d3.csvParse` and renders SVG elements using D3 v5, employing `d3.scaleBand` for the x and subgroup positions, `d3.scaleLinear` for the y-axis, and `d3.axisBottom` and `d3.axisLeft` for the axes.