Oil spike and tariff tensions weigh on U.S. stocks as inflation fears loom

U.S. stock indexes fell to start the holiday-shortened week as oil prices jumped toward $100 a barrel and Canada imposed retaliatory tariffs, fueling inflation concerns and a potential Fed rate hike; the Dow dropped about 1%, the S&P 500 slipped roughly 0.4%, and the Nasdaq edged lower as investors awaited inflation data and Oracle earnings.