I'm not an expert, my knowledge is just from reading around a lot, but I think there's some stats that would suggest the US is particularly exposed:
- At points, AI investment has actually seen more spending that US consumer spending[0], there's some debate on this[1] but if true, that leads to a narrative of the US being 'propped up' by AI investment.
- US GDP growth was strong last year, but behind quite a lot of other similar countries like the UK, Germany and Japan, which doesn't suggest a comparatively strong economy.
- The US is actively increasing it's borrowing substantially (Big Beautiful Bill) while lowering it's currencies value through trade wars and unpredictability (see bond market). That reduces its ability to use its wealth to borrow its way out of a financial crash (like with the 2008 crash, or Covid).
This could be a little overblown and is hard to tell, the US is definitely an extremely wealthy country, even if its less wealthy comparatively that a few years prior.
[0] https://fortune.com/2025/08/06/data-center-artificial-intell...
[1] https://www.cnbc.com/2026/01/26/ai-wasnt-the-biggest-engine-...
On (1): Might be useful to separate investment flows from the rest of US's economic activity.
AI investment is propping up capital flows, the GDP statistic, and responsible for most of the gains on SPX, but its still a small fraction of the economy.