Tariff uncertainty is likely to loom over the U.S. stock market for a while as countries negotiate lower tariff rates or retaliate. Against this backdrop, most analysts agree investors should take the long view and focus on fundamentals.

President Donald Trump's tariffs were expected to be a problem for markets and the economy, but a manageable one. What actually emerged, though, has been economic and geopolitical mayhem. Markets recoiled at the developments,