Final answer:
The claim that President George W. Bush was a proponent of liberal internationalism is false. His policy favored unilateral actions and preemptive measures rather than multinational cooperation.
Step-by-step explanation:
The statement that President George W. Bush was a proponent of liberal internationalism in his foreign policy is false. President Bush's foreign policy was characterized by a doctrine of unilateralism and preemptive war, notably demonstrated in the Iraq War. It strongly differed from liberal internationalism, which emphasizes cooperation between nations and solving international problems through multilateral institutions like the United Nations.