This example visualizes racial demographics across New York census tracts using a multivariate choropleth map. It blends three color scales—green for white population, orange for Black population, and blue for Asian population—using multiplicative color blending via the `colorBlend` library to create a composite hue. The map renders census tract boundaries as SVG paths using `d3.geoPath` with `topojson` features. Population data from the American Community Survey is joined by tract ID, and all values are scaled against a global maximum using `d3.scaleLinear` with opacity gradients.