Zephyrus
Tyrants and Slaves
You are still assuming war will happen because there is a boundary. Alliances were the cause of WWI, and there would have been no WWII if there hadn't been a WWI. You can lay a lot of blame on Woodrow Wilson and America for creating the situation for the Nazis to rise. Meddling in other countries affairs is bad 99% of the time. This includes things like the EU, UN, etc.
Blame the tyrannical heads of state, not the state concept.
World War I was sparked by the gun of a Serbian nationalist.
Yep. Wilson's 14 Points simply sped up the process of forming nation states, and did a crappy job at it. The map of Europe was shittily redrawn, with Germans to the East, West and South placed in foreign countries, just begging for a German nationalist to rise up and liberate them.
Let me do some fanciful speculation here. Imagine if Napoleon won in the end. The World would eventually be divided between the French, Ottoman and Japanese Empires. Would they necessarily fight it out for total world domination, or recognize their limits and work for their mutual economic benefit? Don't answer this by saying Napoleon would have never succeeded. Just assume the situation I posed.