In 1921, he joined the National College of Asuncion where in 1925 became to preside over the Student Center and ran magazine "Ariel" along with Juan Esteban Carrón.
During the presidency of Higinio Morínigo, Cardozo went to live into exile settled in Buenos Aires where he wrote for the newspaper "La Razon".
[1] During the government of Félix Paiva he was appointed Plenipotentiary Delegate to the Peace Conference which took place in Buenos Aires with the presence of American representatives.
The government of President Estigarribia was part of his first cabinet, holding the portfolio of Justice, Cult and Civic Instruction, while the post of interim chancellor.
Since 1923 until the beginning of the war with Bolivia, he published several works related to the defense of the legal rights of Paraguay in the conflict which threatened with the loss of Chaco Boreal.
His collection of 13 volumes of "A hundred years ago," compilation of articles the newspaper "La Tribuna", published throughout the centennial of the epic of the 1870s, remains as testimony to undeniable great value.
Member of a hundred institutions and academies across the continent and Spain, he studied the social and historical memory of the American nations, his views being important in the formation of intellectual generations of young students and researchers.