Can U.S. stock markets keep rising even at the rest of the world’s expense? President Donald Trump seems determined to test the limits of American exceptionalism but it’s a risky approach.New tariff threats and Trump’s castigation of Ukraine’s President Volodymyr Zelensky shook Europe.

The president warned of 25% tariffs being levied on automobiles, semiconductor chips and pharmaceutical imports.

U.S. stocks rallied to the brink of a record Thursday after more companies reported fatter profits than expected. Wall Street mostly yawned, again, at the latest announcement on tariffs by President Donald Trump,

American stocks have been trailing behind their European counterparts in the month since President Donald Trump took office, amid uncertainty about the country's economic future and challenges facing its highest-performing players.