A linked choropleth map and scatter plot visualize global happiness data, highlighting country scores, GDP per capita, and continent groupings. Interactive tooltips reveal detailed country information on hover. The map uses `d3.geoPath` with a `d3.geoEqualEarth` projection and `d3.scaleLinear` for color encoding. The scatter plot, built with `d3.axisBottom` and `d3.axisRight`, shows a log-scaled GDP axis against happiness scores, colored by continent using `d3.scaleOrdinal`. Data is rendered as SVG from loaded map and country datasets.