Among the options listed, here are the three best reasons: 1. Terrorists operate across multiple nations globally, which means they do not exclusively plan or execute their actions within the USA; they conduct insurgencies from various nations, necessitating cooperation with other countries in fighting terrorism. 2. Terrorism poses a threat to other nations as well; the USA is not the only target; many other nations like Britain, France, and Spain also face attacks. 3. Collaborating and pooling resources and expertise from multiple nations is more effective when addressing a global threat, hence the USA seeks international cooperation in combating terrorism.
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