One of the earlier empirical studies of the relationship between regime type and terrorism published in International Interactions determined that while established democracies were significantly less likely to experience terrorist attacks than were nondemocratic countries, newly established democracies were highly vulnerable to terrorism. Subsequent empirical studies have routinely controlled for both regime type and age, but scholarly understanding of the effect of regime longevity on terrorism remains underdeveloped. This study revisits the relationship between terrorism and regime type and regime age using updated data, analytical techniques, and time-series and finds that while young democracies experience more terrorism than older democracies, dictatorships of any age experience less terrorism than any other type of regime.
Piazza, James A. 2013. "Regime Age and Terrorism: Are New Democracies Prone to Terrorism?" International Interactions 39 (January): 246-263. http://www.tandfonline.com/doi/abs/10.1080/03050629.2013.768481