Nuclear crisis:
I'll ask my dad tonight.
War with Iraq:
In the late 80's we encouraged Iraq to go to war with Iran over stupid land disputes because we were enemies with both countries (Israel supported Iran also, but then again we support Israel). The war accomplished nothing and tens of millions of people died. Now Saddam isn't cooperating with us so we waged war on him (using democracy and WMD's as ecuses) In reality though, it isn't a democracy because we don't like their elected leader and are making them choose a new one.
Terrorists (not so sure on this one but here's my best guess):
We supported Afghanistan during their war with Russia. After the war, the leftover soldiers took over and waged a civil war. A group from the north, known as the taliban became vigilantes and restored justice. (Probably didn't answer your question but oh well...)
Do you need sources for your bibliography?