the long chains

[loki100]

While I'm at this, mainly due to my own game I've become aware that a couple of the longer chains - Italian and German unifications and WW1 can derail if a seemingly unimportant event doesn't happen.

What I'll start doing in this thread is to list out those chains by event, showing the interdependencies and where there is a potential for it not to happen. May then be worth revisiting those key areas where the chains intersect (Italy is problematic with the Piombieres and the Garibaldi chains) and WW1 has all sorts of events building into it.