Catholicism on the island was a product of centuries of Spanish colonial control as the island was part of the Spanish East Indies until 1898, when the United States acquired it after the Spanish–American War.
On October 14, 1965, the vicariate apostolic was raised to a diocese.[1] The first supreme pontiff to visit the island was Pope John Paul II in 1981.[1] Guam has been sending delegations of young people to World Youth Day since 1993.[2]