Earlier quoted context omitted.
Before WWI there was a similar belief in Europe, that the growing economic interdependence would prevent wars from breaking out. Instead once there was a spark, those relationships kept pulling more and more countries into the conflict and turned it into the "Great War".
Were they economic interdependencies or high-level political alliances? The E.U. is clearly an example of the economic interdependency theory. It evolved in post-WW2 Europe from the European Coal and Steel Community. Mineral richness is why the Saarland was given to France after WW2. The idea is that economic integration will lead to political integration from the ground up. My understanding of the pre-WW1 alliances…
Dynastic politics were by and large dead in the 1800s with few exceptions (but generally kings/queens were just pawns in the hand of the politicians unlike in the preceding centuries).