This interactive choropleth map displays global life expectancy by country, with a selectable year slider that updates the color-coded visualization. Built with React and D3 v7, it loads UN WPP data from a CSV file and combines it with world GeoJSON topology using continent geometry from world-atlas. The map uses d3.geoPath, d3.scaleSequential, and d3.interpolateYlGnBu to render country polygons, while d3.pointer and mouse events drive tooltip interactions showing country names and values.