A horizontal bar chart displays the 2018 population of US states and Washington D.C., sourced from datausa.com. The visualization uses D3 v5 with an SVG rendering, where the x-axis is customized using `scaleLinear` and `axisBottom` with a tick formatter to abbreviate large numbers (e.g., converting G to B). The y-axis uses `scaleBand`, and the chart includes a title and axis label styled via CSS.