A line graph displays population change in an unspecified U.S. state from 1999 to 2013, with the x-axis mapping years and the y-axis showing population values. It uses React to load CSV data from a GitHub gist, then renders an SVG through D3 v5, employing `d3.scaleTime`, `d3.scaleLinear`, `d3.axisBottom`, `d3.axisLeft`, and `d3.line` to draw axes, grid lines, and an orange path. The chart includes axis labels, a title, and styled tick marks.