Income in the U.S. by state, faceted over income brackets

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Vega-Lite JSON Specification

{
  "$schema": "https://vega.github.io/schema/vega-lite/v3.json",
  "width": 500,
  "height": 300,
  "data": {
    "url": "data/income.json"
  },
  "transform": [
    {
      "lookup": "id",
      "from": {
        "data": {
          "url": "data/us-10m.json",
          "format": {
            "type": "topojson",
            "feature": "states"
          }
        },
        "key": "id"
      },
      "as": "geo"
    }
  ],
  "projection": {"type": "albersUsa"},
  "mark": "geoshape",
  "encoding": {
    "shape": {"field": "geo","type": "geojson"},
    "color": {"field": "pct","type": "quantitative"},
    "row": {"field": "group","type": "nominal"}
  }
}