Isabel, born María Estela Martínez Cartas, a grade school drop-out and a former nightclub dancer, proved to be a thoroughly incompetent and weak president. During her presidency, a military junta along with the Peronists' far-right fascist faction became once again the de facto head of state. She served as President of Argentina from 1974 until 1976 when she was ousted by the military. Her short presidency was marked by the collapse of Argentine political and social systems and led to a constitutional crisis paving the way for a decade of instability, left-wing terrorist guerrilla attacks, and state-sponsored terrorism.