President Lyndon B. Johnson giving Rep. Michael Feighan the famous "Johnson treatment" --€” using his imposing physical presence to persuade --€” aboard Air Force One during a presidential trip to Cleveland in 1964. LBJ put heavy pressure on Feighan to support the new immigration legislation. Feighan eventually agreed,€” but he demanded a crucial change to the act. Princeton University Library/Simon & Schuster hide caption

itoggle caption Princeton University Library/Simon & Schuster

The altar where Pope Francis will celebrate Mass in Revolution Square in Havana near a government building decorated with the likeness of revolutionary hero Ernesto "Che" Guevara. The Mass is scheduled for Sept. 20. Desmond Boylan/AP hide caption

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Vietnamese-Americans light candles at St. Helena, a Catholic church in Philadelphia, on April 4. Like many other once-struggling churches, St. Helena has been revitalized by immigrant parishioners. About 200 Vietnamese families worship at this church, along with others from Latin America, the Philippines and Africa. Matt Rourke/AP hide caption

itoggle caption Matt Rourke/AP