WARREN, Michigan — President Donald Trump gambled his presidency and the economy on a sweeping tariff strategy that his blue-collar supporters in Michigan are counting on to work.

After announcing “Liberation Day” tariffs on nearly 90 countries, ratcheting up a trade war with China, and hitting Canada and Mexico with fresh levies, it was fitting that Trump spent his 100th day in office in a pocket of America all too familiar with the loss of manufacturing jobs.