Just as it is fair to object to the EU claiming all the credit for "peace in our times" I think to dismiss it as having no contribution to the longest period of peace is also spurious.

One tangible benefit was working with Ireland within the EU having shared interests and working together within the Union to achieve common aims contributed to the building of trust and much improved relationships and this contributed to the success of the peace process taking hold. Is it the only contributing factor? Of course not but it was a key part of that success.

Of course it had a significant contribution. from years of hatred and resentment because we were still occupying their country there was a need to negotiate and to work together. you don't think the Irish government were putting pressure on Sinn Fein? I didn't say it was the only thing but it was part of the story.

You are also wildly wrong about Blair being "largely responsible". To her credit Mrs Thatcher had no qualms about negotiating with the IRA. You might also want to google Paddy Mayhew to bring yourself up to speed.

The peace process in Northern Ireland has absolutely nothing to do with the EU. It is largely the result of the efforts of Blair.

It's a fair question.
Since 1945 which European countries were likely to be in conflict?

None, post WWII almost all of their international power basis was gone, and the ensuing wars of national liberation largely ended any real likelihood of coming into conflict.

The power in the world had shifted. The 'imperial' European powers were no longer the big players on the board. That was the Americans and Soviet Union.

If anything, its arguable that a rise of a European Superstate would be more of a risk of conflict, as it would draw its interests inevitably against either the Chinese, Russia Federation and US (if it was to obtain its former power basis).

None, post WWII almost all of their international power basis was gone, and the ensuing wars of national liberation largely ended any real likelihood of coming into conflict.

The power in the world had shifted. The 'imperial' European powers were no longer the big players on the board. That was the Americans and Soviet Union.

If anything, its arguable that a rise of a European Superstate would be more of a risk of conflict, as it would draw its interests inevitably against either the Chinese, Russia Federation and US (if it was to obtain its former power basis).