NEW YORK—Wall Street’s building frenzy around artificial intelligence helped yank the stock market higher Thursday, even as worries worsen about political rancor in Washington. The S&P 500 rallied 0.9 percent after chipmaker Nvidia gave a monster forecast for upcoming sales as it benefits from the tech world’s rush into AI. It helped the Nasdaq composite…

NEW YORK—Wall Street fell again Wednesday as stocks tumbled worldwide on worries about the economy. The S&P 500 dropped 0.7 percent after House Speaker Kevin McCarthy said Republicans and Democrats remain “far apart” in their efforts to prevent a potentially disastrous default on the U.S. government’s debt. The main U.S. stock index is on track…

NEW YORK—Stocks slid Tuesday as the U.S. government crept closer to the edge of a potentially disastrous default on its debt. The S&P 500 fell 1.1 percent after House Speaker Kevin McCarthy said, “We’re not there yet” on a deal to prevent the U.S. government from running out of cash. That followed a meeting late…

NEW YORK—Stocks drifted to a mixed finish Monday, as Wall Street waited for the results of a pivotal meeting meant to avoid a potentially disastrous default on the U.S. government’s debt. The S&P 500 was at a virtual standstill after flipping between small gains and losses through the day. It edged up by 0.65, or…

NEW YORK—Wall Street’s best week since March ran out of steam Friday as worries rose about the U.S. government’s efforts to avoid a potentially disastrous default on its debt. The S&P 500 slipped 6.07 points, or 0.1 percent, to 4,191.98. The Dow Jones Industrial Average fell 109.28, or 0.3 percent, to 33,426.63, while the Nasdaq…