Help! only getting 1 line on time series chart

<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="utf-8">
		<title>Participants vs. Clients</title>
		<script type="text/javascript" src="https://d3js.org/d3.v3.js"></script>
		<style type="text/css">
			
			body {
				background-color: white;
				font-family: Helvetica, Arial, sans-serif;
			}

h1 {
				font-size: 24px;
				margin: 0;
			}

p {
				font-size: 14px;
				margin: 10px 0 0 0;
			}

svg {
				background-color: white
			}

.axis path,
			.axis line {
				fill: none;
				stroke: black;
				shape-rendering: crispEdges;
			}
			
			.axis text {
				font-family: sans-serif;
				font-size: 11px;
			}

</style>
	</head>
	<body>

<h1>Program participants vs. Clients by Program</h1>

<p>Comparison between program participants and clients served </p>

var w = 700;
			var h = 600;
			var padding = [ 20, 10, 50, 100 ];  //Top, right, bottom, left

var dateFormat = d3.time.format("%Y");

var xScale = d3.time.scale()
								.range([ padding[3], w - padding[1] - padding[3] ]);
			
			var yScale = d3.scale.linear()
								.range([ padding[0], h - padding[2] ]);

var xAxis = d3.svg.axis()
							.scale(xScale)
							.orient("bottom")
							.ticks(6)
							.tickFormat(function(d) {
								return dateFormat(d);
							});

var yAxis = d3.svg.axis()
							.scale(yScale)
							.orient("left");

var line = d3.svg.line()
				.x(function(d) {
					return xScale(dateFormat.parse(d.year));
				})
				.y(function(d) {
					return yScale(d.participantsserved);
				});

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

d3.csv("ParticipantsServed.csv", function(participantsData) {

d3.csv("ClientsServed.csv", function(clientsData) {

var mergedData = participantsData.concat(clientsData);
					
					xScale.domain([ 
						d3.min(mergedData, function(d) {
							return dateFormat.parse(d.year);
						}),
						d3.max(mergedData, function(d) {
							return dateFormat.parse(d.year);
						})
					]);

yScale.domain([ 
						d3.max(mergedData, function(d) {
							return +d.participantsserved;
						}),
						0
					]);

svg.data([ participantsData ])
						.append("path")
						.attr("class", "line participants")
						.attr("d", line)
						.attr("fill", "none")
						.attr("stroke", "blue")
						.attr("stroke-width", 2);

svg.data([ clientsData ])
						.append("path")
						.attr("class", "line clients")
						.attr("d", line)
						.attr("fill", "none")
						.attr("stroke", "red")
						.attr("stroke-width", 2);

svg.append("g")
						.attr("class", "x axis")
						.attr("transform", "translate(0," + (h - padding[2]) + ")")
						.call(xAxis);

svg.append("g")
						.attr("class", "y axis")
						.attr("transform", "translate(" + (padding[3]) + ",0)")
						.call(yAxis);

});

</script>

</body>
</html>L

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

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