Trying to parse XML in python using ElementTree?

Trying to parse XML in python using ElementTree?

I'm fairly new to python, but I'm trying to create an API for a website.
However, I'm having trouble accessing an attribute of the XML document I'm
trying to parse.
The file looks like this:
<WORLD>
<NEWNATIONS>
nation1,nation2,nation3,nation4,nation5,etc,etc
</NEWNATIONS>
</WORLD>
How do i access the nations in that XML file, preferably as a list? Again,
I'm completely new to Python, but I've been scouring the internet for
answers and I can't find any.
My code looks like this right now:
import xml.etree.ElementTree as ET
from urllib2 import urlopen
response = urlopen("SITE URL")
tree = ET.parse(response)
root = tree.getroot()
for child in root:
print child.attrib
So... I can get it to print "World", I can get it to print "NEWNATIONS",
but I can't get it to print the nations within the "NEWNATIONS" tag. Help?