A tile-grid map of the contiguous United States shows average annual rainfall per state. Each state is represented by a blue circle, with the circle’s area scaled to the rainfall amount using a square-root transform (via `d3.scaleSqrt`) to keep differences visible. State abbreviations are not rendered; instead, full state names appear as text labels placed below each circle. The visualization uses `d3.select` and `d3.join` to create the SVG circles and text, drawing from static arrays of state locations and rainfall values derived from USA.com data.