National Spiritual Assemblies are first mentioned in ʻAbdu'l-Bahá's Will and Testament, but the fact that they would be established circulated for years before the contents of the Will became publicly available in early 1922. In 1909, wrote extensively about the role of the national House of Justice (as it would have been known then) in his "The Universal Religion: Bahaism, Its Rise and Social Import." In that year, also, the Baháʼís of the United States and Canada elected a nine-member “Executive Committee” for the Bahai Temple Unity, a continental consultative body formed to build the Baháʼí House of Worship in Wilmette, Illinois, a suburb of Chicago. Subsequently the Bahai Temple Unity, which held annual conventions, appointed committees to publish Baháʼí literature, coordinate the spread of the Baháʼí Faith across North America, and review Baháʼí publications for their accuracy. By the time of ʻAbdu'l-Bahá's passing in November 1921, the Bahai Temple Unity functioned as a “national” Baháʼí coordinating body.