This choropleth map visualizes total population by country for 2022, using a threshold color scale with seven blues to indicate population ranges. It renders world geography via `d3.geoPath` with a Mercator projection, and loads country boundary data from a GeoJSON file while fetching population statistics from a CSV. Hovering over a country triggers animated opacity changes and highlights the selected region with a black stroke, with tooltips showing the country name and its population value.