D3 Examples - Chocolate bars . . . and axes!

Research
Why, indeed, are Canada and Mexico the chief exporters of chocolate to the United States, when quite different countries come to mind when we think of cocoa, cacao, and chocolate? When I started searching for this information, I readily came across the USDA article "Processed Product Spotlight: Chocolate Candy". Though this document reminded me of the existence of NAFTA, it did not directly claim that NAFTA was the reason for the high volume of Canadian and Mexican chocolate exports to the United States. But I had no clue how to proceed with my research. I would love to know, for example, where all this imported chocolate initially goes and what it's mostly used for.
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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8" />
    <title>Canadian Cacao?</title>
    <style>
        body {
            background-color: ivory;
            font-family: helvetica, sans-serif;
        }
        
        svg {
            margin: 12px 0 12px 12px;
        }
        
        
        .graphBlock {
            position: absolute;
            top: 110px;
        }
        
        
       #textBlock {
            position: absolute;
            top: 145px;
            left: 590px;
            border-left: 1px solid sienna;
            padding: 0px 12px 0px 16px;
        }
        
        .hangingindent {
            padding-left: 1px ;
            text-indent: -8px ;
        }
        
        .bar {
            fill: sienna;
        }
        
        h1 {
            margin: 24px 0 0 32px;
            padding-bottom: 2px;
            font-weight: bold;
            font-size: 30px;
            border-bottom: 4px solid sienna;
            color: sienna;
        }
        
        
        h2 {
            margin: 24px 0 0 32px;
            font-weight: bold;
            font-size: 20px;
            color: sienna;
            min-width: 600px;
        }
        
        h3 {
            color:sienna;
            font-size: 16px;
            margin-bottom: -6px;
            margin-top: 0px;
            padding-top: 3px;  
        }
        
        .intro {
            padding: 0;
            margin: 4px 0 0px 32px;
            font-size: 13px;
            color: black;
            min-width: 600px;
        }
        
        .sidenote {
            line-height: 120%;
            font-size:13px;
            margin-top: 10px;
        }
          
        .source {
            padding: 0;
            margin: 0px 0px 0px 32px;
            font-size: 11px;
            color: black;
            font-style: italic;
            position: absolute;
            top: 380px;
        }
    
        a {
            text-decoration: none;
            color: sienna;
        }
​
        .axis path,
            .axis line {
                fill: none;
                stroke: #ccc;
                shape-rendering: crispEdges;
            }
            
        .axis text {
                font-family: sans-serif;
                font-size: 10px;
        }
​
        .y.axis path,
        .y.axis line {
                opacity: 0;
        }
            
        .y.axis text {
             fill: black;
             font-size: 12px;
        }
        
    </style>
    <script type="text/javascript" src="https://d3js.org/d3.v3.min.js" charset="utf-8"></script>
</head>
​
<body>
    <header>
        <h1>Canadian Cacao?</h1>
    </header>
    
    <div id="textBlock">
        <h3 class="hangingindent">&ldquo;Chocolate&rdquo; defined</h3>
        <p class="sidenote">For this dataset, &ldquo;chocolate&rdquo; comprises preparations with sugar, milk, or other fats in bulk form (block, slab, or bar); and sweetened cocoa powder. </p>
        <h3>The power of NAFTA</h3>
        <p class="sidenote">The US Department of Agriculture says that &ldquo;North American Free Trade Agreement partners Canada and Mexico are not only the main destinations for US exports but also the main suppliers of chocolate candy to the US market.&rdquo;  </p>
<p class="sidenote">But that doesn't necessarily mean that Canada's and Mexico's strong presence is <em>because</em> of NAFTA &mdash; does it? </p>
    </div>
    
    <script>
    
        /* 
        The addCommas function is from https://www.mredkj.com/javascript/nfbasic.html. It's used to format the dollar amounts in the titles/tooltips.
        */
        function addCommas(nStr) {
            nStr += '';
            x = nStr.split('.');
            x1 = x[0];
            x2 = x.length > 1 ? '.' + x[1] : '';
            var rgx = /(\d+)(\d{3})/;
            while (rgx.test(x1)) {
                x1 = x1.replace(rgx, '$1' + ',' + '$2');
            }
            return x1 + x2;
        }
​
​
        var w = 600;
        var h = 250;
        var padding = [ 15, 60, 25, 110 ];  //Top, right, bottom, left
        
        var widthScale = d3.scale.linear()
                    .range([ 0, w - padding[1] - padding[3] ]);
            
            var heightScale = d3.scale.ordinal()
                    .rangeRoundBands([ padding[0], h - padding[2] ], 0.15);
                    
                    
            var xAxis = d3.svg.axis()
                            .scale(widthScale)
                            .orient("bottom");
​
            var yAxis = d3.svg.axis()
                            .scale(heightScale)
                            .orient("left");
        
        d3.select("body").append("h2").attr("style","intro").text("US chocolate imports, 2013, in millions of dollars");
        
        d3.select("body").append("p").attr("class", "intro").text("Import values of chocolate entering US ports and their origin of shipment");
​
        var svg = d3.select("body")
                        .append("svg")
                        .attr("width", w)
                        .attr("height", h)
                        .attr("class", "graphBlock");
        
    
        d3.csv("cocoa2_3-final.csv", function(data) {
            
            data.sort(function(a,b) {
                // thank you for the hint about forcing the strings!
                return d3.ascending(+a["2013"], +b["2013"]);
            });
            
            
            widthScale.domain([ 0, d3.max(data, function(d) {
                    return +d[2013];
                }) ]);
            
            heightScale.domain(data.map(function(d) { return d.Source; } ));
            
            var rects = svg.selectAll("rect")
                                .data(data)
                                .enter()
                                .append("rect");
                                
            rects.attr("x", padding[3])
                    .attr("y", function(d) {
                        return heightScale(d.Source);
                    })
                    .attr("width", function(d) {
                        return widthScale(d[2013]);
                    })
                    .attr("height", heightScale.rangeBand())
                    .attr("class", "bar")
                    .append("title")
                    .text(function (d) {
                    var dollarAmount = d[2013] * 1000000;
                    dollarAmount = addCommas(dollarAmount);
                    return  "$" + dollarAmount + " worth of chocolate was imported from " + d["Source"] + ".";
                    });                 
                                
                                
                svg.append("g")
                    .attr("class", "x axis")
                    .attr("transform", "translate(" + padding[3] + "," + (h - padding[2]) + ")")
                    .call(xAxis);
​
                svg.append("g")
                    .attr("class", "y axis")
                    .attr("transform", "translate(" + padding[3] + ",0)")
                    .call(yAxis);
​
            });             
                                
                                
​
    
         // source line under chart
    // the commented-out lines were part of an aborted attempt
    // to try to add a link to the SVG text
    d3.select("body")
        .append("p")
        .attr("class", "source")
        //.append("a")
        //.attr("xmlns", "https://www.w3.org/2000/svg")
        //.attr(":xlink", "https://www.w3.org/1999/xlink")
        //.attr("version","1.1")
        .text("Source: USDA, ")
        .append("a")
        .attr("href", "https://www.fas.usda.gov/gats")
        .append("span")
        .text("www.fas.usda.gov/gats");     
            
            
    </script>
</body>
</html>
​
    
Chocolate bars . . . and axes!

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