A choropleth-style SVG map displays New York State's counties, filtered from a TopoJSON US atlas by state FIPS code. The map uses the Albers USA projection via `d3.geoAlbersUsa()` and renders county boundaries with `d3.geoPath()`. D3's data join methods add, update, and remove path elements as data changes. County shapes are filled pale green with gray strokes, sized within an 800 by 900 pixel SVG.