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Forget about the wars where a nation was forced, or thought it was forced, to defend itself.
In all the other wars, which by definition were wars of aggression, was there any enduring benefit to the nation which started it? Or to the target nation?
And by ‘enduring’, I mean up to today and for the foreseeable future.
Alexander, Caesar, Genghis Khan, Napoleon, Hitler, and countless others over the centuries all had their great victories.
So how come that the Greeks are confined pretty much to their original lands (yes, I know that classical Greece was very different, but modern Greeks don’t know or won’t accept that because it stuffs up their claims about Greek nationality), bitterly disputing minor border and name issues with their neighbours in a nation of no international significance; the Mongols are exactly where; the French are confined pretty much to where they started (yes, I know they started further east and are about as French as the Greeks are Greek) and are of international significance mostly as spoilers and pains in the arse; the Germans are confined to their lands (yes, I know their history too, which is about as homogenous as the Greeks and French) without attracting any of the problems and odium the Greeks and French manage to attract; and countless others still fight as do the Basques and many other small groups in various parts of the world?
In a century or two, will any of it matter to anyone who isn’t locked into some obscure historical or nationalist sentimental argument of the sort which has allowed some conflicts to continue to today, and for the foreseeable future?
Apart from advancing the interests of the ruling, or merchant, or money lending, or industrial classes, what war of aggression has delivered any lasting benefit to the nation which fought it and or to the people of that nation, and which has been worth the cost on all sides?