A dam Silver is one of America’s most powerful men. Part businessman and part diplomat, he leads a multibillion-dollar international conglomerate and exercises soft power across continents. But on the day we met, the commissioner of the National Basketball Association appeared aimless, drifting awkwardly through the roped-off VIP area of a sports-business conference in Nashville. Silver had just concluded a keynote session. Unlike other headliners, such as Major League Baseball’s Rob Manfred