NEW YORK (AP) — U.S. stock indexes fell sharply as Wall Street’s frenzy around artificial-intelligence technology faltered some more. The S&P 500 sank 1.6% Thursday for its fifth drop in six days after setting an all-time high last week. Concerns about the U.S. economy’s future have been behind much of the drop, including worries about President Donald Trump’s tariffs, and the index has lost all but 1.4% of its rally since Election Day. The Dow Jones Industrial Average fell 0.4%, and the Nasdaq composite tumbled 2.8%. Nvidia and other high-momentum AI stocks weighed heavily on the market Thursday as Wall...