Thirty Years War? Maybe a little too much to do with theology. Second World War? Pretty straight forward, but then again also one or two bits that are their whole entire subject of discussion. Not sure I’d want to get into any of that quite yet.  Vietnam? Bit heavy on the geopolitics and not something I know a whole lot about anyway. Try explaining Communism or more specifically the Soviet Union and the domino theory to someone who doesn’t know about Russia or why they had a revolution. Iran-Iraq? Again, lots of background that needs setting up. More revolutions to explain.