The best reason why the United States should work with other countries as part of national security policy is because it is already stated as goal of her national security that the U.S. national security strategy will be based on American internationalism that reflects the union of her values and her national interests.
What are national interests?
National Interest is a rationality of governing referring to a sovereign state's goals and ambitions, be they economic, military, cultural, or otherwise.
Therefore, the correct answer is as given above.
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