Chapter 6 investigates the manifestations of the politicization and securitization of immigration over time in Spain, the UK, and the US, each of which experienced acts of terrorism between 2001 and 2005. The chapter’s objectives are to illuminate the trajectory of inter-political party competition regarding immigration and the propensity of the major parties to securitize and politicize immigration. It plots the interaction of the key variables of our immigration threat politics paradigm as these are illuminated in each country’s political context. Among these are the predominant threat frames, attitudinal influences, popular policy preferences, and patterns of inter-party politics regarding immigration. The evidence reveals that the shift from a predominant economic and/or cultural threat frame to a public safety one precipitates depolitization and a popular and an inter- party consensus regarding immigration in the near term. However, once restrictive policies are embedded and the salience of immigration recedes, familiar patterns of inter-party competition resume.