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<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="https://unpkg.com/topojson-client@3"></script>
<script>
var svg = d3.select("svg");
var path = d3.geoPath();
d3.json("https://unpkg.com/us-atlas@1/us/10m.json", function(error, us) {
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https://d3js.org/d3.v4.min.js
https://unpkg.com/topojson-client@3