History of Jehovah's Witnesses
Jehovah's Witnesses originated as a branch of the Bible Student movement, which developed in the United States in the 1870s among followers of Christian Restorationist minister Charles Taze Russell. Bible Student missionaries were sent to England in 1881 and the first overseas branch was opened in London in 1900. The group took on the name International Bible Students Association and by 1914 it was also active in Canada, Germany, Australia and other countries. The movement split into several rival organizations after Russell's death in 1916, with one—led by Russell's successor, Joseph "Judge" Rutherford—retaining control of both his magazine, "The Watch Tower", and his legal and publishing corporation, the Watch Tower Bible and Tract Society of Pennsylvania.
Japanese new religions
GHQ invited many Christian missionaries from the United States to Japan, through Douglas MacArthur's famous call for 1,000 missionaries. Missionaries arrived not only from traditional churches, but also from some modern denominations, such as Jehovah's Witnesses. The Jehovah's Witnesses missionaries were so successful that they have become the second largest Christian denomination in Japan, with over 210,000 members (the largest is Catholicism with about 500,000 members). In Japan, Jehovah's Witnesses tend to be considered a Christianity-based Shinshūkyō, not only because they were founded in the 19th century (as were other major Shinshūkyō), but also because of their missionary practices, which involve door-to-door visiting and frequent meetings.