In 1921, Pope Benedict XV authorized the Paulist Fathers to use Santa Susanna to create the national church in Rome of the United States of America. The first public Mass for the American community was celebrated by Cardinal William Henry O'Connell on February 26, 1922 and until today, the English–speaking Roman parish ministers to American Catholics living in or visiting Rome. [...]
The church consists of a single nave, with a circular apse forming two side-chapels. The frescoes of the central nave by Baldassare Croce represent six scenes from the life of Susanna found in the Book of Daniel. The frescoes on the curved side of the apse shows Saint Susanna being threatened by Maximian, but defended by the angel of God and to the right, Susanna refusing to worship the idol Jupiter. Nebbia's frescoes of the dome of the apse depict Santa Susanna flanked on either side by angels with musical instruments. Behind the high altar, the painting depicting the beheading of Santa Susanna is by Tommaso Laureti".