Here are the likely intended roles for the respective positions based on your prompts:
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Secretary of State: Handles the diplomatic relations between the United States and other countries.
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Secretary of Commerce: Creates and recommends new approaches to dealing with the economic growth and international trade.
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Secretary of Defense: Provides strategies needed to protect and defend the United States.
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Secretary of Homeland Security: Enforces domestic law by preventing and controlling terrorism and other threats.
If you have any further questions or need additional information about any of these positions, feel free to ask!