Final answer:
A United States warship in a friendly nation's harbor demonstrates the concept of Power Projection.
Step-by-step explanation:
A United States warship in a friendly nation's harbor demonstrates the concept of Power Projection. Power projection refers to a nation's ability to extend its military force and influence beyond its own borders. By deploying a warship in a friendly nation's harbor, the United States is projecting its power and presence in that region, sending a signal of its military capabilities and readiness to respond to potential threats.