This document compares the homeland security strategies of the United States and United Kingdom. It discusses how the US and UK intelligence structures differed prior to 9/11, with the UK having more experience with domestic terrorism due to conflicts in Northern Ireland. After 9/11, both countries restructured their intelligence agencies and counterterrorism strategies. The US created the Department of Homeland Security and refocused the FBI, while the UK modified its model to focus on prevention. Both nations also developed national preparedness strategies, though the US approach was more extensive due to its broader definition of homeland security.