Wrong problem, I think. The US doesn't know why, and you can't do "how" unless you know "why". If the policy objectives are uncertain, unrealistic, unclear, or just plain absent, the "how" is always going to be deficient.
The Romans knew why they were doing what they were doing: they were an imperial power, they wanted to preserve and extend direct control over subject peoples. The policy objective was clear. The Brits and the french once had that clarity, but they no longer do. The US doesn't have it, and while it complicates matters a lot, it's not necessarily a bad thing. An imperial America is about the last thing the world needs (IMO, of course).
Is there a difference between "grand strategy" and "policy"? If so, what is it?
Unless you end up bleeding yourself into exhaustion trying to sustain that control. Great powers fall more often from hubris, overextension, and excessive ambition than from restraint and a focus on their internal affairs.
What you typically overlook is to make this method practical you'd have to grant leaders an almost unlimited ability to decide where and when violence is applied, and the risk of that outweighs any benefit. You'd have to trust politicians, and nobody sane does that.
Yes, it's all down to that pesky and intractable phenomenon called democracy. Alas, we've yet to find a way to "deal with that issue" without creating far worse ones.
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