European colonialism, followed by some of the totalitarian regimes in West Africa, have tried to suppress Vodun as well as other traditional religions. However, because the vodun deities are born to each clan, tribe, and nation, and their clergy are central to maintaining the moral, social and political order and ancestral foundation of its village, these efforts have not been successful. Recently there have been moves to restore the place of Vodun in national society, such as an annual International Vodun Conference that has been held in the city of Ouidah, Benin since 1991.