One can argue about the causes -- and no doubt there are many, the biggest IMO being that WW2 was so horrific that Europeans were willing to do anything to prevent it again -- but there's no disputing that the last 75 years of peace in Europe is unprecedented in its long history of near-continuous inter-state warfare for the past ~2000 years (since "Pax Romana").
> WW2 was so horrific that Europeans were willing to do anything to prevent it again
But this is total childish nonsense. We gained 75 years of peace in Europe not because the war was terrible, but because the entire world was divided between the USA and the USSR. And, as it happened, these two countries decided not to fight each other in a full-scale war.
The reason we gained 75 years of peace is because France and Germany decided to form an alliance to prevent further conflict (considering they had just fought 2 wars in the space of 40 years), and, as a secondary goal, to reduce dependence on the US (de Gaulle being especially eager), starting with the Treaty of Rome, and evolving into the EU.
