Pope Francis has celebrated a large open-air Mass in Philadelphia, ending his six-day visit to the US.
He appealed for unity and family love, as thousands of people gathered at the city's Benjamin Franklin Parkway.
Earlier, the pontiff prayed with a group of victims of child sexual abuse, saying "God weeps" for their suffering.
Clergy and bishops abusing children would be held accountable, he said. The Roman Catholic Church in the US has been embroiled in child sex scandals.
US dioceses have made huge compensation payouts to victims.
However, many abuse survivors are angry at how the Vatican has dealt with allegations.
'Pray for me'
During Sunday's homily in Spanish, the 78-year-old Argentine pontiff called the crowd to be open to "miracles of love for the sake of all the families of the world".
“The urgent challenge of protecting our home includes the effort to bring the entire human family together in the pursuit of a sustainable and integral development, for we know that things can change."
And finishing Mass, the Pope said: "I ask you to pray for me. Don't forget."
Earlier on Sunday, he met the five victims, all now adults who had suffered sexual abuse as children, during a seminary in Pennsylvania.