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"Today, political democracies, new and old alike, are under siege. Understanding the circumstances of their origins and early survival in Europe helps us not only grasp how new democracies emerge, but also offers insight into the sources of potential resilience in today's old democracies. For countries democratizing today, old regime elite party organization can help democracy thrive, no matter whether those old elites are aristocrats, single-party leaders, or modern-day tyrants; democracy depends on the buy-in of these groups, and political parties offer one route to that end"...
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Daniel Ziblatt (2017) studied this question.