> It's not like we'd ever allow a neighboring nation to join a military alliance with an adversarial force, and so there simply will never be a ground threat.

> It's not like we'd ever allow a neighboring nation to join a military alliance with an adversarial force, and so there simply will never be a ground threat. For what it's worth, I agree with your argument, but I want to point out that the only reason we have the luxury of never allowing a neighboring nation to join alliances is because we have such massive military and technological advantages that aren't being sabotaged from within.