How do you link grouping to the necessity of nationalism? If there were no nations (but one), you'd end up with various forms of regionalism; but you wouldn't have wars otherwise local military/militias was/were formed. For this to happen, you'd need a serious cultural split.
There's a vast difference between saying world peace can be achieved tomorrow by signing a dozen of documents today, and that saying it is at all possible.
Why is a huge country like the USA firmly united, while a small country like Serbia recently split in two? It shows us that size does not matter for unity; identity on the other hand, does. Identities change as history goes; they are as fragile as words drawn in the sand at a beach.
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