This visualization displays United States expenditure as a percentage of GDP over time, from 1800 onward, using a smooth blue line chart. The SVG rendering employs d3.csv to load data and d3.scaleLinear for both axes, with axisBottom and axisLeft generating gridlines. d3.line with curveBasis creates the smoothed path, while d3.extent sets the domains. The chart includes clearly labeled axes for Year and Expenditure, with data sourced from a CSV file hosted on VizHub.