This visualization displays Major League Baseball stadiums on a polished map of the United States, with circles sized according to stadium capacity and colored by division. Built with React and D3 v5, it uses `d3.geoAlbersUsa` projection and `d3.geoPath` to render state boundaries and interiors from US Atlas TopoJSON data. The map loads stadium coordinates, capacities, and divisions from a CSV file, applying `d3.scaleSqrt` for circle sizing. Interactive dropdown menus allow filtering by division, supported by React state management and custom axis and legend components.