If the question 'why peace?' was come at in a different context, in my opinion the EU would simply not rank as a primary cause. It would be something like (in order)
- Mutually Assured Destruction
- US/Soviet military dominance
- German Holocaust Shame after WW2
- Rising living standards/post war cultural revolution.
- End of Empire as a plausible goal for a nation
Furthermore, the UK wasn't a member for decades, and I don't think war was viewed as a possibility at the time it did join.Both the peace and the EU would seem to as easily explained by the post war situation where European nations were now second tier economicly, and threatened by a big external nation. The reward for war was no longer there, and the need for cooperation was high.
Russia, though large, was not regarded as a serious military threat to Europe. When attacked by Russia, Poland (!) beat Russia in the 1920's and gained half of the Ukraine and half of Belarus in the subsequent peace treaty.
An although a European nation was no longer the world largest economy, they were still regarded as the powers that mattered. The Washington Naval Treaty on arms control between the wars even gave the US a ship allocation on par with a European nation.
The world at the time still revolved around Europe and the actions of European powers. To be premininet in Europe was to lead the world.
Wasn't this also true for eg WW1?
Even with the same actors
I don't think either one was true the case after after WW1.
Russia, though large, was not regarded as a serious military threat to Europe. When attacked by Russia, Poland (!) beat the snot out of Russia in the 1920's and gained half of the Ukraine and half of Belarus in the subsequent peace treaty.
An although a European nation was no longer the world largest economy, they were still regarded as the ones that mattered. The world at the time still revolved around Europe and the actions of European powers. To be premininet in Europe was to lead the world.
It really doesn't do anyone any favours to make claims like this; the breakup of Yugoslavia and the associated genocides were hideous:
https://en.wikipedia.org/wiki/Breakup_of_Yugoslavia
(cards on table: I'm very pro-EU)
Europe will remain strong, regardless of this, won't it?
For some conflicts, yes. The Good Friday agreement in Ireland is a legal fiction, only possible because of the EU. Basically, the border vanishes because both sides are members of the EU and thus, via the EU have the right to move across that border at any time for any purpose.