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1) Threats from who? Canada? Mexico? For the past ~150 years, the US has really only had overseas conflicts with few threats to domestic territory. The best argument you could make it the Cuba Missile Crisis, I suppose? If your immediate plan is to stop fighting in far away places, then drones aren't really a worry.

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Threats to your allies, for example.

"If your immediate plan is to stop fighting in far away places, then drones aren't really a worry."

Yes, you can dismantle the entire coalition your presidents put together for 70+ years, but at some cost. The US economy is heavily intertwined with the rest of the world, and it probably cannot decouple from China AND forty democratic countries that used to be US allies at the same time.

Might be cheaper just to respect the current entanglements, at least in the long run.

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