This line chart displays the cumulative number of COVID-19 cases in the United States over several months, from January to July 2020, using data from the Data Canvas - Sense Your City project. The visualization uses D3 v5’s `scaleTime`, `scaleLinear`, `axisBottom`, `axisLeft`, and a line generator with `curveBasis` to render the smooth maroon path on an SVG canvas. The chart includes labeled axes for time and temperature, though the data actually tracks case counts, with a title noting “A Week in San Francisco.” The code loads the CSV data with `csv()` and applies the D3 margin convention for layout.