Most likely North Korea, because the US govt has had their sites set on them for a while now.
Not Cuba, because Castro is a few years from death, and his regime will not survive him. The Cold War is old news, so Cuba's sort of a non-issue nowadays.
Iran I'm not entirely sure about. That may be why the US is pushing to take over Iraq...they're not going to make the same mistake they made before...by putting another Saddam in power.
@Suwi - it's very true, although my Scottish/English ancestors came here almost 250 years ago...haha, that's a long time away.