What changed
US technology stocks suffered a steep sell-off on 5 November after Democratic midterm victories intensified concerns about slower AI development and tighter limits on data-centre construction. The Nasdaq fell more than 5.5%, wiping out an estimated $2.5tn in market value, while Nvidia dropped more than 9%, AMD and Micron more than 17%, and the seven largest technology companies lost about $1tn in one trading day.
Why it matters
This was a political shock landing on top of an existing business question: can the enormous spending on AI infrastructure produce the returns investors expect? Democratic campaigns had targeted the rapid expansion of data centres, and Texas governor-elect Gina Hinojosa backed a moratorium on new construction there.
That matters because data centres are the physical bottleneck behind much of the AI boom. If proposed restrictions become binding, developers may face a slower path from announced projects to operating facilities. The damage would reach beyond the companies building those sites: Nvidia, AMD, Micron and other semiconductor firms are valued partly on expectations of sustained demand from this expansion.
For now, the market is pricing in fear rather than a settled verdict. The sell-off could prove to be a short-term political risk shock, or the first serious reassessment of whether AI returns justify the infrastructure bill. The S&P 500 fell 4.4% and the Dow Jones Industrial Average more than 3.4%, showing that investors treated the news as a broader market problem, not a narrow dispute over planning rules.
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