This example visualizes annual U.S. auto sales by brand from 2015 to 2022 as a single red line chart. The x-axis encodes years as dates using `d3.scaleTime`, while the y-axis maps numeric sales values with `d3.scaleLinear`. Data is loaded from a CSV file via `d3.csv`. The chart renders as SVG, with axes drawn using `d3.axisBottom` and `d3.axisLeft`, and the line generated by `d3.line`. Grid lines and axis labels are styled through CSS classes.