By the end of 1906, most leaders from Azusa Street had spun off to form other congregations, such as the 51st Street Apostolic Faith Mission, the Spanish AFM, and the Italian Pentecostal Mission. These missions were largely composed of immigrant or ethnic groups. The Southeast United States was a particularly prolific area of growth for the movement, since Seymour's approach gave a useful explanation for a charismatic spiritual climate that had already been taking root in those areas. Other new missions were based on preachers who had charisma and energy. Nearly all of these new churches were founded among immigrants and the poor.