Old school D3 from simpler times

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US Fertility by State

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<!DOCTYPE html>
<meta charset="utf-8">

<style type="text/css">
  body {
    font-family: arial, sans;
    font-size: 14px;
    width: 960px;
    margin: 40px auto;
  }
  svg {
    border: 1px solid #ccc; 
  }
  .states {
    stroke:#fff;
    fill:none;
  }
  .counties {
    stroke: #fff;
    fill: green;
    stroke-width: .3px;
  }
  .county-bubble {
    stroke:#fff;
    stroke-width: .3;
  }
</style>

<body>

</body>

<script src="https://d3js.org/d3.v4.js" charset="utf-8"></script>
<script src="https://d3js.org/topojson.v1.min.js"></script>

<script type="text/javascript">
  
var width = 960,
    height = 500;
var color = d3.scaleLinear()
	.range(["#d73027","#fc8d59","#fee08b","#ffffbf","#d9ef8b","#91cf60","#1a9850"])
	.domain([80,75,70,65,60,55,50]);
var radius = d3.scaleSqrt()
    .range([0,20])
    .domain([0,500000]);
var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);

d3.queue()
    .defer(d3.tsv, "fertilityState.txt")
    .defer(d3.json, "us.json")
    .await(ready);

function ready(error, births, us) {
  if (error) return console.warn(error);
  console.log(births);
  console.log(us);
  console.log(topojson.feature(us, us.objects.states).features);
  birthsByFips = {};
  births.forEach(function(d) {
    d.Births = +d.Births;
    d["Fertility Rate"] = +d["Fertility Rate"];
    birthsByFips[+d["State Code"]] = d;
  });
  var path = d3.geoPath()
    .projection(d3.geoAlbersUsa());
  var subset = topojson.feature(us, us.objects.states).features.filter(function(d) {
    return d.id in birthsByFips;
  });
  svg.append("g")
      .attr("class", "counties")
    .selectAll("path")
      .data(subset)
    .enter().append("path")
      .attr("d", path)
      .style("fill", function(d) { 
        return color(birthsByFips[d.id]["Fertility Rate"])
      });
  svg.append("path")
      .datum(topojson.mesh(us, us.objects.states, function(a, b) { return a.id !== b.id; }))
      .attr("class", "states")
      .attr("d", path);
}
</script>

Modified http://d3js.org/d3.v4.js to a secure url

Modified http://d3js.org/topojson.v1.min.js to a secure url

https://d3js.org/d3.v4.js

https://d3js.org/topojson.v1.min.js