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Thanks for the fast reply, the grouping option sounds like a good solution as a first step -- there might be instances where this is not applicable -- especially if you'r going further back in time [e.g. the principalities of the Holy Roman Empire were radically different to the german Bundesländer today].

Very cool project btw...

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Yeah, I know what you mean. I would love to be able to show the actual boundaries changing over time. I've thought of a way to do that but don't have the data, but I think it wouldn't be too hard to do. Another idea I was thinking about was for the CSV data itself to help define the boundary. For example, if you wanted to track the amount of land that ISIS had over time, your CSV data could define which towns (or lat/lon) belonged to which group and then page could 'join the dots' to create the boundaries. Then the boundaries could be created arbitrarily. There would be some other complications that would need to be solved, but that's one of the ideas I've been thinking about.

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