The modern world has been shaped by imperialism, a practice engaged in by all great powers and some lesser ones. Empires are history but their consequences are not. Their dissolution has given rise to a multitude of new states, restored independence to formerly independent units, and reduced the size and influence of former metropoles. Decolonization, whether peacefully or violently accomplished, has given rise to a series of new conflicts among successor states, among neighboring states, and between metropoles and former colonies. We might lump these conflicts together as post-imperial. If so, many kinds of conflicts would fit under this rubric. They could encompass colonial and postcolonial conflicts, rump states, partitioned countries, and arguably other categories as well like revenge and regional rivalries. I have accordingly opted for a finer-grained analysis.