Isabel Martínez de Perón
María Estela Martínez Cartas de Perón (born 4 February 1931), better known as Isabel Martínez de Perón () or Isabel Perón, served as the 42nd President of Argentina from 1974 to 1976. She was the third wife of President Juan Perón. During her husband's third term as president from 1973 to 1974, Isabel served as both vice president and First Lady. Following her husband's death in office in 1974, Isabel served as president of Argentina from 1 July 1974 to 24 March 1976, when the military took over the government and placed her under house arrest for five years, before exiling her to Spain in 1981. She holds the distinction of having been the first woman to have had the title of "President", as opposed to a queen or prime minister.
María Teresa Obregón Zamora
Between 1948 and 1952, Obregón served in the Ministry of Education overseeing baccalaureate exams and in 1951 served as a delegate of the Inter-American Commission of Women. That same year, she became a co-founder of the National Liberation Party () and headed the Women's Committee for the party. Obregón was one of the first three women delegates to win a seat in the Costa Rican legislature, when in 1953, the first election in which women were allowed to vote, she, Ana Rosa Chacón and Estela Quesada won seats in the House of Deputies. She served as first Secretary of the Board of the Legislative Assembly and is credited as the first woman to deliver a speech in the Legislative Assembly. Obregón died in office on 29 September 1956 before her term had expired.