What are you talking about? The US navy protects the commercial shipment routes around the world.
Before the US Navy did that, the Royal Navy did. The work needs to be done, but it doesn't have to be the US doing it.
Likely soon corporate owned drones will protect commercial shipping routes I would think. Not sure if bad actors (pirates?!) will have their own drones.
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The gratuitous hostility undermines your point.
Hmm, there are rail routes across Eurasia.