In the original publication of this article Figure 4 was incorrectly duplicated in Figure 5, US counterterrorism spending as a percentage of total federal budget, 2001–2017. The correct Figure can be found below and has been corrected in both the online PDF and HTML versions of the article. The Publisher apologises for this error.
![](https://static.cambridge.org/binary/version/id/urn:cambridge.org:id:binary:20230707131121216-0829:S1867299X23000430:S1867299X23000430_fig1.png?pub-status=live)
Figure 5. US counterterrorism spending as a percentage of total federal budget, 2001–2017.
Source: Stimson Study Group, “Counterterrorism Spending: Protecting America while Promoting Efficiencies and Accountability” (2018). CT = counterterrorism; FY = financial year.