A multi-line chart shows population growth rates for the United States, Canada, and Mexico from 1890 to 2010, using data simplified from the CORGIS Global Development dataset. Three colored paths, generated with `d3.line()` and `d3.scaleLinear`, represent each country over time. Hovering over any gray circle reveals a tooltip with the exact country, year, and growth value via mouse events. The chart uses D3 v7 to render an SVG with axes, a legend, and a black background.