Article: Pius XII asked Archbishop Montini to Rome October 1957, where he gave the main presentation to the Second World Congress of Lay Apostolate. Previously as Pro-Secretary, he had worked hard to unify a worldwide organization of lay people of 58 nations, representing 42 national organizations. He presented them to Pius XII in Rome in 1951. The second meeting in 1957 gave Montini an opportunity to express the lay apostolate in modern terms: "Apostolate means love. We will love all, but especially those, who need help... We will love our time, our technology, our art, our sports, our world."

Question: How many nations did Montini hope to unify as Pro-secretary?
58