The most basic map using d3js v4.0. Just to learn a little about using the new version…
<!DOCTYPE html>
<meta charset="utf-8">
<style>
.states {
fill: #ccc;
stroke: #fff;
}
</style>
<body>
<script src="https://d3js.org/d3-array.v1.min.js"></script>
<script src="https://d3js.org/d3-geo.v1.min.js"></script>
<script src="https://d3js.org/d3-selection.v1.min.js"></script>
<script src="https://d3js.org/d3-collection.v1.min.js"></script>
<script src="https://d3js.org/d3-dispatch.v1.min.js"></script>
<script src="https://d3js.org/d3-request.v1.min.js"></script>
<script src="http://d3js.org/topojson.v1.min.js"></script>
<script>
var width = 960,
height = 500;
var projection = d3.geoAlbersUsa();
var path = d3.geoPath()
.projection(projection);
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
d3.json("us.json", function(error, us) {
svg.append("path")
.attr("class", "states")
.datum(topojson.feature(us, us.objects.states))
.attr("d", path);
});
</script>