Stock market today: Dow, S&P 500, Nasdaq fall as chip stocks tumble, oil surges on US-Iran tensions

U.S. stock indexes fell Monday as escalating U.S.-Iran military tensions in the Middle East sent oil prices above $82 per barrel and pressured semiconductor stocks. The Dow declined 0.3%, the S&P 500 dropped 0.8%, and the Nasdaq fell 1.6% after the U.S. renewed strikes near the Strait of Hormuz over the weekend and Iran retaliated against American allies including Kuwait, Jordan, and Qatar. President Trump vowed to reinstate a blockade of the strait and impose a 20% fee on transiting cargo, while markets await inflation reports and the start of corporate earnings season this week.