This visualization shows a map of the United States, plotting blue circles at the centroid of each state to represent the percentage of fully vaccinated residents as of September 4, 2021. The radius of each circle is scaled proportionally to the vaccination rate, allowing viewers to compare state-level progress at a glance. The code uses the D3.js library (version 5) with `geoAlbersUsa` projection and `geoPath` to render state boundaries, while `d3.scaleLinear` maps vaccination percentages to circle radii. State centroids come from a local JSON file, and vaccination data is loaded from a GitHub Gist containing U.S. vaccination data by state and territory.