This choropleth map visualizes the spread of COVID-19 cases over time, with an animating date slider and play/pause controls. The map uses d3.geoEckert5 projection, d3.geoPath, and TopoJSON, with color scales from colorbrewer and d3-scale-chromatic to shade regions by case counts. A draggable slider, built with d3.drag and d3.timeScale, shows daily case data from January to July 2020, while a legend and graticule provide spatial context.