This line chart visualizes the cumulative global death toll from COVID-19 over time, using a single black path that rises sharply as the pandemic progresses. A horizontal marker line at the 1,000,000 death threshold is labeled with the corresponding value. The visualization is built with React and D3 v6, using `scaleTime` and `scaleLinear` to map dates and death totals, and a `line` generator to create the path. Data comes from the CSSEGISandData COVID-19 time series CSV, loaded via `d3.csv`, and is rendered as SVG inside a `<g>` element with explicit margins.