This line chart visualizes the total population estimates for Texas from 2020 to 2024, aggregating county-level data from the Census Bureau. The chart draws a smooth steelblue line with orange circles marking each year’s total. Built with D3 v7, the code loads a CSV via `d3.csv`, sums population columns using `d3.sum`, and renders the SVG with `d3.line`, `d3.curveMonotoneX`, and linear scales for the axes.