A U.S. economy that has weathered a year of trade, immigration and other shocks now faces a new test likely to ratchet up uncertainty after President Donald Trump's decision to launch open-ended attacks against Iran with the stated goal of toppling the Middle Eastern country's long-ruling Islamist government. With counter-strikes underway throughout the region and Trump saying the conflict could go on for weeks at least, analysts are focused on a long list of imponderables as oil prices jumped over the weekend from $70 to nearly $80 a barrel before slipping back somewhat and shipping through the strategic oil lanes in the Strait of Hormuz began grinding down.