This line chart displays the US unemployment rate from 1920 to 1980. It uses D3 v5 with scales from `d3.scaleLinear` and `d3.scaleTime`, and axes from `d3.axisLeft` and `d3.axisBottom`. The line is generated with `d3.line`, and the data is loaded as CSV from a GitHub gist. The SVG rendering includes styled grid lines, axis labels, and a title, with the blue stroke path emphasized via CSS.