Cinema of Argentina because harassment led to the exile of a number of prominent actors, among them Alberto de Mendoza, Arturo García Buhr, Niní Marshall and Libertad Lamarque, whose rivalry with her colleague Eva Duarte turned against her when the latter became First Lady in 1946. Argentine cinema began losing viewership as foreign titles gained an increasing foothold in the Argentine market. The problem eventually became so bad that Argentina tried to curb the influx with the Cinema Law of 1957, establishing the "Instituto Nacional de Cinematografía" to provide education and funding. Among the era's most successful films were: "Historia de una noche,"
First Lady of Colombia did not signify the marginalization of the First Lady from political activity, and that she as wife of the President embodied the idea of national unity. Since then, the First Lady has continued to pursue, at her discretion, humanitarian causes in an "ad honorem" capacity. Over the course of the 20th century it became increasingly common for first ladies to select specific causes to promote, usually ones that are not politically divisive. María Teresa Londoño Sáenz led the collection for donations during the Colombia–Peru War, María Michelsen Lombana championed orphans' rights and care, Lorenza Villegas Restrepo pioneered public for health