Wall Street is closely watching escalating tensions in the Middle East after President Trump confirmed that the US launched a surprise strike on Iran’s nuclear sites late Saturday, marking the country’s official entry into the two-week-old conflict. Markets have held mostly steady in the aftermath of the escalation, although US stock futures fell across the board when trading opened Sunday evening. Additionally, bitcoin (BTC-USD) prices, often viewed as a barometer of risk appetite, dropped over 1.6% to trade around $100,500 a coin. WTI crude (CL=F) and Brent (BZ=F) futures jumped,...