The lack of retaliation by any trading partner(e for massive US tariffs that have been imposed is a true - world always chickens out - where policymakers across the world end up showing by their (non)actions the unreplicability and importance of U.S. aggregate demand to their economies, since it was as recent as 2018 where the entire world did retaliatory tariffs for U.S. steel/aluminum tariffs. The world writ large is so in need of aggregate U.S. demand to drive their economies that they will sign into perpetuity - permanent tariff inequality and simply accept unequal treatment, even in a way there weren’t a decade ago.
China’s retaliation was much less than the U.S. tariffs (China’s 10% hike vs. the U.S.’ 30% hike) and Canada WACOed in all but name