It focuses on one person, but that person was elected. Whether he's re-elected or not, the support that put him there remains. It makes the US an unreliable partner: agreements made today can be broken tomorrow. Our allies will be much less likely to make the kinds of serious, long-term commitments if they can't be sure they'll be held.

That America-first sentiment has always been there, but other countries have always trusted the government to rein it in. It could be dog-whistled at but didn't drive policy. Now that it has done so, they must assume it will do so again.