Despite a strong rally in U.S. stocks in May, uncertainty still looms. Optimism surrounding paused tariffs and potential trade resolutions lifted markets, but caution remains due to rising interest rates, a growing U.S. deficit, and a fresh debt downgrade.

April’s markets reflected a classic case of short-term volatility amid long-term uncertainty, with U.S. stocks dipping slightly while international equities and bonds offered relative stability. As Van Morrison sang, “there’ll be days like this,” reminding investors to stay the course when markets feel uncertain.

As expected, investment markets around the world responded to yesterday’s announcement by President Trump that new...