The chaotic scenes now playing out as the Taliban take over Afghanistan have unsurprisingly drawn comparisons to the collapse of the South Vietnamese government in 1975. But there have been many similar instances, though most were a little slower: the end of Indonesian rule in East Timor (now Timor L’Este), the French withdrawal from Algeria, and the earlier Russian withdrawal from Afghanistan.

The common feature in all these cases is the attempt by an external (sometimes neighbouring) power to impose and then sustain a government of its choosing, usually in the hope that it will ultimately secure the support of the majority of the population along with international acceptance. The usual outcome is a long period of relatively low-level conflict, during which it can be made to appear that a successful outcome is just around the corner. In some cases, actual fighting ceases and is replaced by a ‘frozen conflict’, in which life proceeds more or less normally most of the time, but without any final resolution.

Very occasionally, these attempts succeed (the US invasion of Grenada is one example, and I expect commenters can come up with more). But far more commonly, the external power eventually tires of the struggle and goes away. Alternatively, frozen conflicts can continue more or less indefinitely, as with Israel-Palestine.
If successful interventions are the exception rather than the rule, it’s natural to ask why they are so popular? Certainly, the military-industrial complex benefits from war and lobbies for it, but the same is true of any activity that involves spending a lot of public money. Then there are psychological biases which seem to favor both starting wars in the expectation of an easy win and persisting when the conflict drags on.

But learning takes place eventually. After taking part in centuries of bloody conflict, all around the world, Europeans seem mostly to have tired of war. And in the US, weariness with ‘forever wars’ seems finally to be eroding the belief that armies can solve complex problems in other countries