The Baháʼí Faith was first mentioned in the United States in 1893 at the World Parliament of Religions in Chicago. Soon after, early American converts began embracing the new religion. Thornton Chase was the most prominent among the first American Baha'is and made important contributions to early activities. One of the first Baháʼí institutions in the U.S. was established in Chicago and called the Baháʼí Temple Unity, incorporated in 1909 to facilitate the establishment of the first Baháʼí House of Worship in the West, which was eventually built in Wilmette, Illinois and dedicated in 1953. As of 2020 the Association of Statisticians of American Religious Bodies noted the Baháʼí Faith was the largest non-Christian religion in the majority of US counties. ʻAbdu'l-Bahá became head of the Baháʼí Faith after his father Baha'u'llah (Founder of the religion) died in 1892. He visited the United States and Canada in 1912, ultimately reaching some 40 cities from April to December. He promoted his father's teachings on peace and unity and consolidated the fledgling western Baháʼí community. After returning from his journey, ʻAbdu'l-Bahá continued corresponding with American Baháʼís, eventually addressing to them a series of letters, or tablets, charging the believers with the task of spreading the religion worldwide. These letters were compiled in Tablets of the Divine Plan. Following ʻAbdu'l-Bahá's death in 1921, his grandson Shoghi Effendi became the Guardian of the Faith, and continued to encourage and direct the efforts of the American and worldwide Baháʼí community. In 1925, the first National Spiritual Assembly of the United States was formed in conjunction with the Baháʼís of Canada. In 1937, Shoghi Effendi asked believers to begin the systematic implementation of ʻAbdu'l-Bahá's vision of teaching the Faith worldwide, calling for American pioneers to assist in establishing Baháʼí communities in the republics of Latin America. Later coordinated efforts, such as the Ten Year Crusade from 1953–63, would see American pioneers sent to a wide variety of locations around the globe. At the conclusion of the first 7-year Plan in 1944, it was reported that every state in the United States had at least one Local Spiritual Assembly, and the national Baháʼí population was estimated at 4,800. In its 2020 annual report, the National Spiritual Assembly of the 48 contiguous states reported 177,647 registered Baháʼís of all ages, only 77,290 of which had good addresses, and 57,341 total participants in core activities, with 37% of attendees