About & sources

Downloaded data (real, official estimates):

• Population (B01003) & median household income (B19013), states and top 200 places: US Census Bureau, American Community Survey 2018–2022 5-year, table-based Summary File (www2.census.gov/programs-surveys/acs/summary_file/2022/table-based-SF/). ACS figures are survey estimates with margins of error.
• Place coordinates: Census 2022 Gazetteer places file.
• State GDP by industry (SAGDP2, 2024, current $): US Bureau of Economic Analysis, apps.bea.gov/regional/zip/SAGDP.zip. "Specialised sectors" = top 3 sectors by location quotient (state share ÷ US share, sectors ≥3% of state GDP), with NAICS grouped into broad tags.

Derived / estimated: city cards use their state's sector mix as a proxy; money-flow text and "how to get a share" ideas are qualitative commentary, not data.

Virtual market sizes are rounded, approximate figures drawn from public reports, which differ: IAB/PwC & eMarketer/Statista (digital ads), Sensor Tower/data.ai (app stores), Goldman Sachs (creator economy, 2023), Newzoo (games 2024), Gartner (public cloud 2024), Statista (e-commerce, affiliate, AI). Verify before relying on any number.

Stack: MapLibre GL JS, OpenFreeMap tiles, D3 force graph. Geometry: PublicaMundi us-states GeoJSON. No API keys.