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The War of Spanish Succession' and others proved that it wasn't that odd for natiosn in olden days to fight over who had influence over the succeeding ruler in a country.

The challenge is to have such a war as late as possible; and this is in post-1900 because that would be ideal to answer this challenge.

A different WWI might be a thought if you pick the right country; perhaps Austria, if the Archduke isn't assassinated and then when the Emperor dies someone kills a couple of the people in line for the throne. Or maybe even China if everyone's vying for influence colonially. It could always grow into an alternate WW1 wherever you have it.

An almost impossible challenge would probably be a POD post-WWI, though if you wanted to try you could.

Or maybe you think that a 20th century "War of X Succession" is impossible, in which case I invite discussion on when the latest one *would* be. SO, it's not necessarily a 20th century challenge, but I imagine at least someone will try to come up with a good 20th century POD.
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