Guatemala’s protest movement goes national; Latin America’s meddlesome ex-presidents; U.S. border crisis and geopolitical turmoil are taking the pressure off Maduro.

Three decades after its founding, Latin America’s largest trade bloc continues to deal with internal divisions, including over a stalled trade deal with the European Union. New leadership in Argentina and Brazil could shake things up.

Argentina's President Cristina Fernandez de Kirchner waves as she enters Congress for the inauguration of the annual ordinary sessions in Buenos Aires (Marcos Brindicci / Courtesy Reuters). By the e…