Because Mennonites for centuries almost only married inside their churches, they developed into ethnic groups in Russia since 1789 and in North America since the 1730s, where for a long time almost all of them kept their ethno-languages Pennsylvania German and Plautdietsch [REF].
Until the middle of the 1950 the vast majority of Mennonites were of Central European ancestry and culture, all the same if they were conservative or modern and all the same if they lived in Europa, North America, Mexico, Paraguay or in Brazil.