The APA includes 54 divisions, which since 1960 have steadily proliferated to include more specialties. Since 2008, web fiction has proliferated in popularity. In the 1980s, expert systems proliferated. Later, as the Vajrayana Buddhism tradition grew, they proliferated. The American model of adoption eventually proliferated globally. Jukeboxes proliferated nationwide, spreading the gospel of swing. Hotels proliferated throughout Western Europe and North America in the 19th century. Systems of teaching children through their senses proliferated throughout Europe. In addition to the museums, popular entertainment proliferated throughout the city. Folk music festivals proliferated during the 1930s. Taxicabs proliferated around the world in the early 20th century. In many ways more influential than the newspapers were the magazines, which proliferated after 1870. The 18th Street gang, originating in Los Angeles, has proliferated in San Salvador. Buddhist iconography also proliferated in the interior decorations of many buildings. Conspiracy theories concerning the Freemasons have proliferated since the 18th century.