This interactive visualization displays global happiness levels from 2004 to 2017, using data from the World Happiness Report 2017. It combines a line chart showing happiness trends over time with a map, allowing users to click on a country to see its specific happiness trajectory or select a year to view global distribution. Built with D3 v5, the visualization uses `scaleLinear`, `scaleTime`, `axisLeft`, and `axisBottom` to construct the charts, while SVG rendering handles the map and line paths. The interface includes a dropdown menu for year selection and color-coded points representing happiness scores.