Teaching archaeology from 1917 at the University of Palermo, in 1922 Pace joined the National Fascist Party, and in 1924 was a candidate in Sicily on the Fascist slate and was elected to the Chamber of Deputies.

He was consistently re-elected until 1939, and was President of the Legislative Commission for National Education.

On 26 December 1946 Pace presided over the founding meeting of the Italian Social Movement and in 1947 was elected to the National Executive Committee of the party.

In the thirties he directed a mission in the Sahara which brought to light the civilization of the Garamantes.

[1] In 1943 he was assigned the "Mussolini Award" for the Moral & Historical Sciences by the Royal Academy of Italy.