If the next US president withdraws the US in to isolation, our nukes won't really help us. Any hostile nation capable of hitting us with Nukes is also capable of winning a ground war against us. We might threaten to fire, but we wouldn't. We are too small a landmass - the return barrage would wipe us out. I expect most of us would rather live under Russian or Chinese rule than be wiped out by nuclear weapons.
Without US backing, the only times we would actually fire a nuke is if we were first attacked by a smaller, less well armed state that doesn't have allies with nukes, or if we were in the verge of being wiped out (by that I don't mean losing a war, I mean losing a war in which we are being ethnically cleansed). Being a small, densely populated island, every other occasion would end badly for us.
Without US backing, the only times we would actually fire a nuke is if we were first attacked by a smaller, less well armed state that doesn't have allies with nukes, or if we were in the verge of being wiped out (by that I don't mean losing a war, I mean losing a war in which we are being ethnically cleansed). Being a small, densely populated island, every other occasion would end badly for us.
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