Across borders and political systems, a quiet but deliberate reorganization is underway among the world's progressive parties. Alarmed by the transnational momentum of right-wing populism — a force that has reshaped governments from Europe to the Americas — U.S. Democrats are reaching outward, cultivating strategic alliances with left-leaning leaders like Spain's Pedro Sánchez in hopes that a coordinated front might succeed where isolated national responses have not. The effort reflects a deeper recognition: that the challenges facing progressive politics are not uniquely American, and neither