This interactive Gapminder visualization, built with React and D3, maps country-level indicators like income per capita, life expectancy, and fertility rate over time (1950-2015). Users can switch axes, scrub through years with a slider, and hover or click the color legend to highlight or select world bank regions. The map background uses `geoNaturalEarth1` and `geoPath` from D3, while SVG circles are scaled with `scaleSqrt` and colored via `scaleOrdinal`. Data is fetched from a Gapminder summary CSV.