Pope Leo XIV, history’s first American pope, vowed Sunday to work for unity so that the Catholic Church becomes a sign of peace in the world, offering a message of communion during an inaugural Mass in St.

As Pope Leo XIV is formally inaugurated, he vows to work for unity and peace at a time of polarization in the Catholic Church and the wider world, with leaders including Vice President Vance and Ukraine's Zelensky in attendance.

"Welcome his word that enlightens and consoles! Listen to his offer of love and become his one family: 'In the one Christ, we are one.'"