International Impact of Homeland Security Policy In this interconnected and interdependent global society, countries no longer can remain unaffected by the actions of other countries. This is particularly true for homeland security. For instance, a robust U.S. homeland security policy not only ensures better prevention, protection, response to, and recovery from natural disasters and terrorism within the United States, but also affects the homeland security policies of other countries. Similarly, how other countries address their own security threats or cooperate with the United States in counterterrorism efforts influences U.S. security policies. Knowledge of the international impact and implications of U.S. homeland security policies, the effects of international policies on U.S. homeland security policies, and the importance of international collaboration for global security is essential for understanding U.S. homeland security in its entirety.