The new so called world war will likely start out as a civil war, Muslims against the ruling socialists. So, which European caliphate goes first?
England
France
Germany
Sweden
Belgium
Spain
Switzerland
Italy
Denmark
Austria
It's possible that it could start in the Balkans, but the socialists in NATO would likely squash that and kick the can down the road.
Once the Muslims start in one country, expect them to rally in all the others. They do run a tight network through their local citadels. The big question will be how much pent up rage will take the Euopean natives into blood thirsty revenge against the Muslims. In reality, it's the socialists that brought on the problem. They used the Muslims as leverage to take down paternalism.
My bet is on Froggie-Land, with my ancestors in Nutzy-Land and Londonistan coming in a close second.
Cowards. Shame on them.