This choropleth map displays global economic classifications per country, with a natural Earth projection and color-coded fill based on categorical data. Users interactively filter the map by clicking color legend items, which dims all non-selected countries and reduces the sphere’s opacity. The visualization uses D3 v5 APIs including `d3.geoPath`, `d3.geoNaturalEarth1`, `d3.scaleOrdinal`, and `d3.zoom`, with topojson loading world-atlas data. Hovering a country reveals its name and value via a tooltip, while the legend highlights the active selection.