"How Democracies Lose Small Wars" might provide you with some interesting information as well. Granted the author's focus is more on the involvement of democracies in external small wars as opposed to internal insurgencies, but he does have some good observations about the ability of democracies to conduct wars that might be unpopular with a segment of their own electorate.
Eden makes a good point regarding a political settlement. In some cases it might actually be a victory of sorts for both sides. Sounds like an interesting topic, although you may need to be mindful of the Cold War political impacts within some of the earlier insurgencies mentioned. By that I mean the actual motivations and driving forces behind some of those movements, which might have made them more vulnerable to political settlements by the government (i.e., grant concessions to some of the local insurgent demands [land reform, minority representation, etc.], thereby undercutting the political leverage of some elements of the insurgency.
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