I am trying to color code a map like the one on p 322 of Visualizing Data and I am having two problems:

The first is that many of the maps in the Wikimedia commons appear to be png files even though they have an "svg" extension.  Am I missing something?

The other problem is that I am unsure how to loop through the one svg map that I found given the changes to Processing since Visualizing Data was published (I'm using 0151).

I can draw the map on the screen but then I need a little direction on how to match the states with the data I want to color code them based on.  Can anyone provide a little direction?  Thanks!

Here's the code so far -
 
PShape m;

void setup () {
background(255);
int width = 600;
int height = 500;
size(width,height);
m = loadShape("Blank_US_map_borders_labels.svg");
smooth();
noLoop();
}

void draw(){
 shape(m, 30,30,width - (width*.10),height -(height*.10));
}