A React app displays a scatter plot of U.S. census tract data, plotting households with residents aged 60+ against total population, with color encoding for Latino population percentage and tooltips showing tract names. The visualization loads CSV data from a GitHub gist using the D3 `csv` function with asynchronous `useEffect` and `useState` hooks. The chart is rendered as an SVG via Vega-Lite API, which configures circle marks with opacity and size, while a text overlay reports the dataset's size in kilobytes, row count, and column count.