A deadlier post-9/11 terrorism landscape for the USA abroad: a quasi-experimental study of backlash effects of terrorism prevention
The United States initiated sweeping counterterrorism efforts after the September 11, 2001 terrorist attacks. This study tests a backlash hypothesis as it relates to the nature of attacks against the US abroad.
Relying on data from the Global Terrorism Database, this study uses a quasi-experimental design to investigate whether attacks against the US abroad became more or less lethal after 9/11.
There is a significant increase in the proportion of attacks with fatalities and a significant decrease in the proportions of non-lethal attacks against US targets and interests overseas after 9/11. The results suggest a redistribution in the lethality of attacks against the US abroad.
This study finds evidence of a backlash of deadlier terrorism violence against the US abroad after September 11. Examining for unintended consequences is an important facet of terrorism prevention research and policy.
Keywords9/11 Backlash Counterterrorism Displacement Homeland security Terrorism Time series
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