This visualization displays the 2020 populations of countries as horizontal bars, sorted by country name. Using React for rendering, it maps each country to a rectangle within an SVG canvas, with bar lengths proportional to population values. The code loads UN population data from a CSV file via `d3.csv`, and uses D3's `scaleBand` and `scaleLinear` to compute the y-axis positions and x-axis scaling, respectively. A loading state shows "Loading..." text until the data arrives.