Symbol Map with Text

This this a variation of this bl.ock by Mike Bostock to demostrate the appending text to a map in response to this stack overflow question. The area of each circle in this symbol map is proportional to the population of the associated state.

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

.states {
  fill: #ccc;
  stroke: #fff;
}

.symbol {
  fill: steelblue;
  fill-opacity: .8;
  stroke: #fff;
}

</style>
<body>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script src="https://d3js.org/topojson.v1.min.js"></script>
<script src="https://d3js.org/queue.v1.min.js"></script>
<script>

var width = 960,
    height = 500;

var radius = d3.scale.sqrt()
    .domain([0, 1e6])
    .range([0, 10]);

var path = d3.geo.path();

var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);

queue()
    .defer(d3.json, "/../../data/us.json")
    .defer(d3.json, "/../../data/us-state-centroids.json")
    .await(ready);

function ready(error, us, centroid) {
  svg.append("path")
      .attr("class", "states")
      .datum(topojson.feature(us, us.objects.states))
      .attr("d", path);

svg.selectAll(".symbol")
      .data(centroid.features.sort(function(a, b) { return b.properties.population - a.properties.population; }))
    .enter().append("path")
      .attr("class", "symbol")
      .attr("d", path.pointRadius(function(d) { return radius(d.properties.population); }))
    .append("title")
      .text(function (d) { return d.properties.name; });
      
  // Code to add in text on map     
  svg.selectAll("text")
      .data(centroid.features).enter()    
    .append("text")
      .attr("x", function (d) { return path.centroid(d)[0]; })
      .attr("y", function (d) { return path.centroid(d)[1]; })
      .text(function (d) { return d.properties.name; });   
}

</script>

Modified http://d3js.org/d3.v3.min.js to a secure url

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

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

Changed /mbostock/raw/4090846/us.json to a local referenece

Changed /mbostock/raw/3750900/us-state-centroids.json to a local referenece

https://d3js.org/d3.v3.min.js

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

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