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I doubt any modern country would adopt a monarchy once it has become a republic. The fact countries are monarchies are due to historical reasons. I am of course talking of countries of European culture. It's a gamble really. Modern constitutional monarchies are likely to hold out for long today, unless a period of chaos ensues and they're abdicated, after that happens it's not likely to get reinstated again as of anno 2013. That was different in the 19th century when countries had to be monarchies to be accepted.
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