US stocks are crashing hard today, driven by sudden fear that the AI boom has gone too far — bad news for tech investors, especially anyone holding Nvidia, Tesla, and other AI-linked names.

• The Dow, Nasdaq, and S&P all dropped fast, with the S&P losing trillions in market value in under an hour — one of the quickest sell-offs in stock market history.
• AI and chip-related stocks got hit hardest: Nvidia, AMD, Micron, SK Hynix, Dell, Taiwan Semiconductor, Tesla, and SpaceX-linked names all fell by double digits.
• The trigger seems to be growing talk in Washington of tighter regulation or even a ban on advanced AI development, which spooked investors who had piled huge money into AI stocks.
• Wall Street voices are publicly trying to calm everyone down, pointing to continued high AI spending, while privately some are telling top clients this could be the start of a bigger bubble popping.
• There are also signs of stress inside the Trump administration after midterm losses, with officials starting to resign or consider leaving — adding to the sense of broader instability.

Outlook: Analysts are divided on whether this is just a sharp correction or the start of a longer AI-bubble unwind, with many saying the real test will come when a major AI company misses expectations or gives bad guidance.