This example displays the average population of the United States over time, using a smooth, curved line to connect annual data points ordered by year. The chart is rendered as an SVG with React, using D3’s `scaleTime`, `scaleLinear`, `line()`, and `curveNatural` to map and draw the trend. Axis ticks are generated by reusable React components, and the data is loaded asynchronously from a CSV URL using D3’s `csv` and React’s `useState`/`useEffect`. The visualization is styled with Lato font and a minimal, grid-based aesthetic.