The Wall Street Journal China Gauge Shows Expansion in Factory Activity — A private gauge showed China’s factory activity expanded in March, marking a fifth successive monthly improvement in the country’s manufacturing sector. U.S. Tech Giants Turn to Mexico to Make AI Gear, Spurning China — Some of the biggest U.S. companies in artificial intelligence have asked their Taiwanese manufacturing partners to step up production south of the U.S. border. Early Clues Emerge on Senateâ