Minus the roasted barley, don't ask.
It's basically a high gravity Oatmeal Porter.
The Brewmaster's Bible for Porter says 50-55°, then 55-65°F for Stout. However, this is an "American" beer, so I figure a little colder than 50°F.
Other than it's country of origin, what makes it American? I'd most likely shoot for the mid-50s.
It's American Hopped. Although I just looked it up and Northern Brewer are German hops, so basically it's country of origin.