<p>From Presidents Harry Truman to Donald Trump, the United States liberalized trade the most among developed countries. The average U.S. tariff on dutiable goods is 4.5%, with the average tariff on all goods sitting at below 2%. Meanwhile, U.S. goods face higher tariffs and many other barriers to entry abroad. Facebook still can’t operate in China, and U.S. tech giants face a “digital services” tax in France.</p>