CHICAGO - A nun in Wisconsin is reflecting on almost a half century of teaching in Chicago and one student she knew as Bob, who we now know as Pope Leo XIV. "I was overwhelmed by an emotion I can't even describe. I mean, it just, it didn't seem real," said Sister Dianne Bergant.

Robert Prevost, the Chicago-born missionary who spent his career ministering in Peru and took over the Vatican’s powerful office of bishops, was elected the first pope from the United States in the history of the Catholic Church.