The doctrine was characterized by a commitment to preemptive military action against potential threats, a belief in the importance of spreading democracy and freedom around the world, and a willingness to act unilaterally if necessary to protect U.S. interests.
In the context of the war against terrorism, the Bush Doctrine had several significant implications. First, it led to the invasion of Afghanistan in 2001, which was carried out with the aim of rooting out the Taliban government that had harbored the al-Qaeda terrorist group responsible for the 9/11 attacks. Second, the doctrine provided the justification for the invasion of Iraq in 2003, which was premised on the belief that Saddam Hussein's regime possessed weapons of mass destruction and posed a potential threat to U.S. security.
Critics of the Bush Doctrine argued that the preemptive military action it authorized was too aggressive and undermined international norms and institutions. They also pointed out that the wars in Afghanistan and Iraq were costly in terms of both human lives and financial resources and that they failed to achieve their intended goals. Supporters of the doctrine, however, argued that it was necessary to take strong action to protect the United States from terrorism and that the promotion of democracy and freedom was a worthwhile goal in its own right.