policies of young men ages 14–18 serving as home teachers. June 2018 began with a First Presidency-sponsored celebration of the 40th anniversary of the revelation extending priesthood and temple blessings to all worthy members without regard to race, in which Nelson gave concluding remarks. A few days before this, Nelson and his counselors met with the national leaders of the NAACP. That same weekend Nelson gave a devotional to LDS youth in which he urged them to more fully commit to the church. He encouraged them to collectively choose a period of seven days in which to abstain from the use of social media. On June 18, the First Presidency created committees assigned to form a unified hymnbook and children's songbook for the worldwide church membership, with each language edition having the same hymns (and other songs) in the same order, and that these committees would be taking submissions and collecting surveys until July 2019. It is anticipated that the process of creating the new unified hymnbook and children's songbook will take several years. In August 2018, Nelson issued a statement urging the use of the church's full name. At the church's general conference in October 2018, he reiterated his position, declaring, "It is a correction" and "It is the command of the Lord." Nelson told members that the use of nicknames such as Mormon or LDS was "a major victory for Satan." In the October 2018 general conference, Nelson adjusted the balance between a home-centered, church-supported form of worship. This was highlighted by shortening the length of Sunday church meetings to 2-hours from the previous 3-hours. At the end of the month, Nelson toured five South American countries, during which he met with Peru's president, Martín Vizcarra, gave a major address in Peru in Spanish, and dedicated the Concepción Chile Temple. In December 2018, the church's First Presidency changed the process of youth class progression and priesthood ordination. Beginning in 2019, youth began moving between classes and priesthood quorums at the beginning of the year in which they turn 12, 14, or 16, rather than when their birthday occurs during the year. In April 2019, the church's First Presidency published a revelation reversing a controversial November 2015 policy classifying same-sex marriage couples as apostates, and barring children of same-sex marriages from baby blessings, and from baptism until age 18. Nelson had previously characterized the 2015 policy as direction from