US stocks were mixed on Monday as a looming deadline fueled uncertainty around President Donald Trump’s tariff plans and investors looked ahead to the monthly jobs report and key retail earnings. The S&P 500 (^GSPC) fell 0.2% while the tech-heavy Nasdaq Composite (^IXIC) erased early morning gains to fall 0.4% after the release of weak manufacturing data. The Dow Jones Industrial Average (^DJI) fell below the flat line, as the major US indexes came off a volatile week and a losing February. March trading is kicking off with investors encountering more questions than answers as tariff deadlines loom, the Federal…