Need help with implementing d3.geo.albersUsa()

I’m a newcomer here and apologize if this has been discussed in the past. I am webmaster for a week long music instruction camp that attracts folks from all over the US. I would like to provide a page that shows markers and tootip details about over states where attendees live. I have managed to display a map of the US with state and county borders.

For some reason I cannot display a map using “projection = d3.geo.albersUsa().” I have copied the code from ,  “Zoom to Bounding Box II.” I get a blank screen in FireFox, Edge, and Chrome. Here is the code:

\<!DOCTYPE html\>\<meta charset="utf-8"\>\<style\>.background { fill: none; pointer-events: all; }.feature { fill: #ccc; cursor: pointer; } { fill: orange; }.mesh { fill: none; stroke: #fff; stroke-linecap: round; stroke-linejoin: round; }\</style\>\<body\>\<script src="//"\>\</script\>\<script src="//"\>\</script\>\<script\>var width = 960, height = 500, active =;var projection = d3.geo.albersUsa() .scale(1000) .translate([width / 2, height / 2]);var zoom = d3.behavior.zoom() .translate([0, 0]) .scale(1) .scaleExtent([1, 8]) .on("zoom", zoomed);var path = d3.geo.path() .projection(projection);var svg ="body").append("svg") .attr("width", width) .attr("height", height) .on("click", stopped, true); svg.append("rect") .attr("class", "background") .attr("width", width) .attr("height", height) .on("click", reset);var g = svg.append("g"); svg .call(zoom) // delete this line to disable free zooming .call(zoom.event); d3.json("/mbostock/raw/4090846/us.json", function(error, us) { if (error) throw error; g.selectAll("path") .data(topojson.feature(us, us.objects.states).features) .enter().append("path") .attr("d", path) .attr("class", "feature") .on("click", clicked); g.append("path") .datum(topojson.mesh(us, us.objects.states, function(a, b) { return a !== b; })) .attr("class", "mesh") .attr("d", path); });function clicked(d) { if (active.node() === this) return reset(); active.classed("active", false); active ="active", true); var bounds = path.bounds(d), dx = bounds[1][0] - bounds[0][0], dy = bounds[1][1] - bounds[0][1], x = (bounds[0][0] + bounds[1][0]) / 2, y = (bounds[0][1] + bounds[1][1]) / 2, scale = Math.max(1, Math.min(8, 0.9 / Math.max(dx / width, dy / height))), translate = [width / 2 - scale \* x, height / 2 - scale \* y]; svg.transition() .duration(750) .call(zoom.translate(translate).scale(scale).event); }function reset() { active.classed("active", false); active =; svg.transition() .duration(750) .call(zoom.translate([0, 0]).scale(1).event); }function zoomed() {"stroke-width", 1.5 / d3.event.scale + "px"); g.attr("transform", "translate(" + d3.event.translate + ")scale(" + d3.event.scale + ")"); }// If the drag behavior prevents the default click,// also stop propagation so we don’t click-to-zoom.function stopped() { if (d3.event.defaultPrevented) d3.event.stopPropagation(); }  

Try this link, it helped me out.