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IIRC if you look in country.csv it has each tag, country name and the techgroup it belongs to plus other various info. Can't remember which column it is off the top of my head but it shouldn't be hard to work out. Alternatively the information is in the savefile under each countries info. You can edit the tech group in either. Savefile for one game, country.csv for permanent.
For permanent, first country.csv, you only need to edit the scenario files if that country already have it specified there, or if you only want to change for that specific scenario.