Transatlantic security cooperation among Spain, the United Kingdom, and the United States against terrorism following the 9/11 attacks

This thesis paper will aim to measure and explain the influence of domestic factors, such as domestic public opinion and demands from domestic groups, on international cooperation among different states with varying sets of national interests by using the framework based on the theory of two-level games. The September 11, 2001 terrorist attacks has left the whole world shocked with the new kind of threat of terrorism, thus enabling the formation of the Coalition of the Willing led by the United States. With this, Spain and the United Kingdom’s domestic factors will likely influence their decision with regard to its support and cooperation to combat terrorism