Under the U.S. system of federalism, who or what is responsible for the conduct of foreign policy and defense?

Question

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Under the U.S. system of federalism, the national government (also known as the federal government) is responsible for the conduct of foreign policy and defense. This includes maintaining diplomatic relations with other countries, negotiating treaties, and overseeing the military. While states have limited involvement in foreign affairs, their role is primarily focused on trade and investment promotion.