Answer:
The Bush Doctrine was a belief that the United States had the right to remove perceived threats.
Explanation:
The Bush Doctrine was a term used to describe a set of principles related to the foreign policy of former President George W. Bush, declared as a result of the September 11, 2001 attacks. The phrase initially described in the policy stated that the United States had the right to treat as terrorists the countries that host or support terrorist groups, which was used to justify the invasion of Afghanistan.
It later added additional elements, such as the controversial preemptive war policy, which claimed that the United States should oust foreign regimes that posed a perceived threat to US security, even if this threat was not immediate (used to justify invasion to Iraq).
