I like how this map shows the density of different areas, specifically SoCal, as compared to state lines of today. However, the map seems (possibly intentional

I like how this map shows the density of different areas, specifically SoCal, as compared to state lines of today. However, the map seems (possibly intentionally) to ignore geographical boundaries that are super important. Like the Mississippi River. I know you can modify Voronoi diagrams in multiple dimensions to account for population and geography. Does anyone know of a map that has done so?