The Chicago-born pope addressed a crowd of 30,000 in a live-streamed message from the Vatican: "Build up community [and] friendship as brothers and sisters."

The pope urged Catholic faithful to be a "light of hope," to serve others, and to make the world a better place.

In his first words directed specifically to Americans, Pope Leo XIV told young people on Saturday how to find hope and meaning in their lives through God and in service to others.