No one took it because in Post-Napoleonic War Europe, The Congress of Vienna created the Concert of Europe which vowed to maintain balance of power, stop all liberal and nationalist revolutions and support legitimacy. So no ruling house, Royal or noble, would have accepted a crown from a former colony of one of their fellow monarchs who was considered the legitimate ruler of that land. If they did they would get no support from the major powers in Europe.An Orleans accepts the throne of Mexico in 1821? Nobody else was taking it, so they wound up giving it to Iturbide.
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