Wall Street experienced declines on Monday, with the Dow, S&P 500, and Nasdaq all trading lower amid heightened investor caution due to escalating tensions between the United States and Iran. The 10-year Treasury yield rose to 4.43%, reflecting market uncertainty, while energy sectors showed resilience by outperforming, in stark contrast to the weak performance of materials. Notable stock movements included a 6.7% rise in Micron Technology and a nearly 10% drop for UPS and FedEx, as President Trump announced U.S. support for neutral vessels in response to the crisis.