program is introduced, calling for families to study the gospel together at home. September: Jesus the Christ by James E. Talmage is published. It remains popular to this day. 1916 June 30: "The Father and the Son", an official declaration from the First Presidency, discusses the identities of Heavenly Father and Jesus Christ. 1917 October 2: The Church Administration Building is completed. Russian Revolution which results in the Soviet Union after a protracted civil war. The region is not opened to missionaries until the early 1990s and travel to there by outsiders becomes more difficult. 1918 May 16: Arrangements are announced for the Relief Society to sell its wheat storage of over 200,000 bushels to the U.S. government, to cover military food shortages near the end of World War I. October 4: Joseph F. Smith announces at General Conference his revelation about the ministry to those in the afterlife, now known as Section 138 of the Doctrine and Covenants. October 31: The Quorum of the Twelve and the Patriarch of the Church unanimously accept Smith's revelation as official church canon. November 19: Joseph F. Smith passes away. November 23: Heber J. Grant becomes the seventh president of the LDS Church. 1919 April: General Conference is postponed to June because of the Spanish flu epidemic. November 27: Laie Hawaii Temple first outside continental United States, and thus also arguably first outside North America and first in Polynesia. LDS Church membership reaches 500,000. 1920s 1920 December 2: Apostle David O. McKay and Hugh J. Cannon, editor of the Improvement Era, are set apart for a year-long tour of LDS missions and schools across the world. As the most widely traveled general authority, McKay retains a vision for worldwide church growth. The LDS Church closes its system of academies. 1921 Lectures on Faith removed from Standard Works. New programs for young adults are created, called M-Men and Gleaners. Joseph Fielding Smith's Essentials in Church History is published, an influential book of devotional LDS history that remained in print for more than 50 years. 1922 February 7: Zions Securities founded. May 6: KZN radio (later KSL) goes on air in Salt Lake City, with LDS Church involvement, and makes a message of Heber J. Grant the first church broadcast. May: Primary Children's Hospital opens in its first facilities. Trapped by the Mormons (also released as The Mormon Peril), a 1922 silent British anti-Mormon film