Religious persecution
Religious persecution drove the Brethren to take refuge in Friesland, Netherlands. In 1719 Peter Becker led a group to settle in Pennsylvania. In 1720 forty Brethren families settled in Surhuisterveen in Friesland. They lived among the Mennonites there, remaining until 1729, when all but a handful emigrated to America in three separate groups from 1719 to 1733. By 1740, nearly all of the "Schwarzenau" Brethren had relocated to Pennsylvania and they ceased to exist as an organized group in Europe.