The Bush Doctrine

Just in case you didn't know what it was either, this is how Wikipedia defines it:

The Bush Doctrine is a phrase used to describe various principles of United States president George W. Bush, created in the wake of the September 11, 2001 attacks. There are many and varied elements to the phrase. It is sometimes described as the policy that the United States has the right to treat countries that harbor or give aid to terrorist groups as terrorists themselves, which was used to justify the invasion of Afghanistan.

Later it came to include additional elements, including the controversial policy of preventive war, which held that the United States should depose foreign regimes that represented a supposed threat to the security of the United States, even if that threat was not immediate (used to justify the invasion of Iraq), a policy of supporting democracy around the world, especially in the Middle East, as a strategy for combating the spread of terrorism, and a willingness to pursue U.S. military interests in a unilateral way. Some of these policies were codified in a National Security Council text entitled the National Security Strategy of the United States published on September 20, 2002. This represented a dramatic shift from the United States’ Cold War policies of deterrence and containment, under the Truman Doctrine, and a departure from post-Cold War philosophies such as the Powell Doctrine and the Clinton Doctrine.