Pope Leo XIV appears on the central loggia of St. Peter’s Basilica after being chosen as the 267th pontiff of the Roman Catholic Church at the Vatican on Thursday. The Associated Press

VATICAN CITY — Catholic cardinals broke with tradition Thursday and elected the first U.S. pope, making Chicago-born missionary Robert Prevost the 267th pontiff to lead the Catholic Church in a moment of global turmoil and conflict.

Prevost, a 69-year-old member of the Augustinian religious order who spent his career ministering in Peru, took the name Leo XIV.

In his first words as Pope Francis’ successor, uttered from the loggia of St. Peter’s Basilica, Leo said, “Peace be with you,” and emphasized a message of “a disarmed and disarming peace” dialogue and missionary evangelization.

He wore the traditional red cape and trappings of the papacy — a cape that Francis had eschewed on his election in 2013 — suggesting a return to some degree of tradition after Francis’ unorthodox pontificate. But in naming himself Leo, the new pope could also have wanted to signal a strong line of continuity: Brother Leo was the 13th-century friar who was a great companion to St. Francis of Assisi, the late pope’s namesake.

“Together, we must try to find out how to be a missionary church, a church that builds bridges, establishes dialogue, that’s always open to receive — like on this piazza with open arms — to be able to receive everybody that needs our charity, our presence, dialogue and love,” Leo said in near-perfect Italian.

Prevost had been a leading candidate for the papacy, but there had long been a taboo against a U.S. pope, given the geopolitical power the country already wields. But Prevost was seemingly eligible because he’s also a Peruvian citizen and had lived for years in Peru, first as a missionary and then as bishop, and cardinals may have thought the 21st century world order could handle a U.S.-born pope.

Francis, history’s first Latin American pope, clearly had his eye on Prevost and in many ways saw him as his heir apparent. He sent Prevost to take over a complicated diocese in Peru, then brought him to the Vatican in 2023 to serve as the powerful head of the office that vets bishop nominations from around the world, one of the most important jobs in the Catholic Church.

Earlier this year, Francis elevated Prevost into the senior ranks of cardinals, giving him prominence going into the conclave that few other cardinals had.

Since arriving in Rome, Prevost has kept a low public profile but was well-known to the men who count. Significantly, he presided over one of the most revolutionary reforms Francis made, when he added three women to the voting bloc that decides which bishop nominations to forward to the pope.

The crowd in St. Peter’s Square erupted in cheers Thursday when white smoke poured out of the Sistine Chapel shortly after 6 p.m. on the second day of the conclave, the most geographically diverse in history. Priests made the sign of the cross and nuns wept as the crowd shouted, “Viva il papa!”

Waving flags from around the world, tens of thousands of people waited for more than an hour to learn who had won and were surprised an hour later, when the senior cardinal deacon appeared on the loggia, said “Habemus Papam!” — “We have a pope!” in Latin — and announced the winner was Prevost.

He spoke to the crowd in Italian and Spanish, but not English, honoring Pope Francis and his final salute to the crowd on Easter Sunday.

“Greetings … to all of you, and in particular, to my beloved diocese of Chiclayo in Peru, where a faithful people have accompanied their bishop, shared their faith,” he said in Spanish.

The last pope to take the name Leo was Leo XIII, an Italian who led the church from 1878 to 1903. That Leo softened the church’s confrontational stance toward modernity, especially science and politics and laid the foundation for modern Catholic social thought. His most famous encyclical, Rerum Novarum of 1891, addressed workers’ rights and capitalism at the beginning of the industrial revolution and was highlighted by the Vatican in explaining the new pope’s choice of name.