The pontiff said he would face up to "the questions, concerns and challenges of today’s world" and, in a nod to conservatives, he promised to preserve "the rich heritage of the Christian faith," repeatedly calling for unity.

VATICAN CITY (AP) — Pope Leo XIV vowed Sunday to work for unity in a polarized Catholic Church and world, as history’s first American pope offered a message of healing during an inaugural Mass in St. Peter’s Square before an estimated 200,000 pilgrims, presidents, patriarchs and princes.