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In 1860, Adolf Bastian (1826–1905) argued for "the psychic unity of mankind."  He proposed that a scientific comparison of all human societies would reveal that distinct worldviews consisted of the same basic elements. According to Bastian, all human societies share a set of "elementary ideas" ( Elementargedanken ); different cultures, or different "folk ideas" ( Völkergedanken ), are local modifications of the elementary ideas.  This view paved the way for the modern understanding of culture. Franz Boas (1858–1942) was trained in this tradition, and he brought it with him when he left Germany for the United States.