While the global increase of expatriate dual citizenship acceptance over the past decades has been widely observed, the temporal and spatial contexts of this trend have remained understudied. Based on a novel data set of expatriate dual citizenship policies worldwide since 1960, we find that dual citizenship toleration has increased in the last half century from one-third to three-quarter of states globally. We argue that these domestic policy changes should be understood in light of normative pressure in a world where restrictions on individual choice in citizenship status are increasingly contested and where liberalisation is reinforced through interdependence and diaspora politics. We apply Cox proportional hazard models to examine dual citizenship liberalisation and find that states are more likely to move to a tolerant policy if neighbouring states have done so and that they tend to do so in conjunction with extending voting rights to citizens residing abroad and receiving remittances from abroad. Contrary to other studies, we do not observe significant variation by regime type.

中文翻译：

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外籍人士双重国籍的国际传播

虽然在过去几十年中外籍人士双重国籍的接受度在全球范围内有所增加，但这一趋势的时间和空间背景仍未得到充分研究。根据自 1960 年以来全球外籍人士双重国籍政策的新数据集，我们发现在过去的半个世纪里，双重国籍的容忍度从全球的三分之一增加到四分之三。我们认为，在一个对公民身份的个人选择的限制越来越受到质疑并且通过相互依存和侨民政治加强自由化的世界中，应该根据规范压力来理解这些国​​内政策变化。我们应用 Cox 比例风险模型来检验双重国籍自由化，并发现如果邻国采取了宽容政策，那么这些国家更有可能采取宽容政策，并且他们倾向于这样做，同时将投票权扩展到居住在国外并接收汇款的公民从国外。与其他研究相反，我们没有观察到政权类型的显着差异。