MAGA: “Make America Great Again.” That was U.S. President Donald Trump’s promise to the American people. Elect him, and the country would recover its mojo and return to a golden age of internal harmony, economic vitality, domestic sovereignty, and global influence. It was a seductive vision, especially for those Americans who had been buffeted by globalization and believed that immigrants and “globalists” were undermining the country from within. As Trump’s second term nears the midway point, there can be little doubt that he is one of the most consequential presidents in U.S. history. Unfortunately, almost all the consequences of his...