Pope Leo XIV held his first mass of a 12-day Latin American tour in the western Uruguayan city of Paysandu on Saturday, drawing an estimated 40,000 people despite rain and grey skies. The Vatican said 30,000 had pre-registered, with another 10,000 showing up unannounced. The 71-year-old American pope, who underwent lung cancer surgery last month, told reporters en route from Rome that his recovery owed to "trusting God, good doctors, good surgeons, and overall, I think a healthy lifestyle." The choice of venue is the message. Paysandu sits 375 kilometres from Montevideo — rural, inland, the kind of place global institutions routinely skip. Leo's "bridge builders" homily, delivered at Paris London Park, urged attendees to "forward the mission of evangelisation with enthusiasm" and to form a "fraternal community that comes together and shares life, projects, dreams and hopes." He paid homage to mate tea as a symbol of communal sharing — a small gesture that reads as deliberate cultural fluency from an American pontiff operating on unfamiliar ground. The political context is unavoidable. Latin America has shifted sharply rightward since Donald Trump returned to the White House in January last year, with several allied leaders consolidating power. Brazil's Lula da Silva, re-elected for a fourth term last month, is the outlier. Leo's next stop is Argentina, where he will address President Javier Milei — a libertarian free-market ideologue and close Trump ally whose economic programme runs directly counter to Catholic social teaching on solidarity and the preferential option for the poor. This is the Vatican deploying its oldest instrument: presence. A pope standing in a field in Paysandu, drinking mate, telling people to build bridges — it is soft power at its most elemental. The question is whether moral suasion still registers against leaders whose power base is built on the explicit rejection of multilateral consensus and communitarian economics. Milei did not win on bridge-building; he won on chainsaw rhetoric. Leo's health is the structural uncertainty beneath the tour. Lung cancer surgery a month ago followed by a 12-day, three-nation tour is ambitious for a healthy 50-year-old, let alone a 71-year-old pontiff. Every public appearance doubles as a medical bulletin. His visible good health on Saturday buys credibility for the remaining stops, but the schedule — including a night-time prayer vigil in Montevideo expected to draw 60,000 — is demanding. The tour finishes in Peru after the Argentina leg. The Vatican is betting that showing up still matters — that physical presence in a fragmenting region can do what encyclicals and diplomatic cables cannot. Whether Leo's bridge-building metaphor translates into any material political friction with Milei or the broader Trumpist bloc remains the open question. Symbolism without structural follow-through is a papal tradition older than mate tea.