This scatter plot displays COVID-19 deaths and vaccination rates across US states over time, sourced from the New York Times rolling-averages dataset. The chart uses D3 version 6.7.0 with reusable chart architecture, implementing scaleTime and scaleLinear scales, axisBottom and axisLeft components, and timeFormat for date labels. Custom annotations highlight the United States title and a 30% vaccination threshold. The code imports data via d3.csv and builds circles with selectAll and join patterns, while demonstrating a modular scatterPlot factory function with getter-setter accessors.