Pax Americana is gone. Born with the Japanese attack on Pearl Harbor on December 7, 1941, the U.S.-led international rules-based order died with the second inauguration of Donald J. Trump. The president has long maintained that this order disadvantages the United States by saddling it with the burden of policing the globe and enabling its allies to play it for a sucker. “The postwar global order is not just obsolete,” Secretary of State Marco Rubio declared in his Senate confirmation hearing. “