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Other regional organizations such as the Organization of American States, the (British) Commonwealth, and even the African Union have taken steps down a similar path by adopting formal agreements that commit their members to responding collectively in the event of "unconstitutional" regime changes. Since really existing democracy is a perpetually unfinished product, democratization will always be on the research agenda of political scientists. ... since nothing seems to work well everywhere, they will have plenty of explaining to do.
Philippe C. Schmitter (Fri,) studied this question.