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This interactive bar chart displays GDP per capita for a selection of countries, with bars colored in blue and one highlighted in orange. Users can hover over individual bars to see details and click a checkbox to sort the values in descending order. Built with React and D3 v4, the visualization uses `d3.scaleBand` and `d3.scaleLinear` to map country names and GDP values to SVG coordinates, with `d3.axisBottom` rendering the x-axis labels. The dataset is embedded directly in the code, and CSS classes define the bar colors for normal and highlighted states.