The Salem Witch Trials of 1692 were caused by a combination of factors:
1) A history of witchcraft hysteria in Europe and beliefs from the Bible that witches should be killed.
2) Tensions between religious Puritan communities in Salem Village and Salem Town.
3) Superstitions fueled by the Puritan religion and accusations from young girls that led to mass hysteria.
4) Over 150 people were accused of witchcraft and 20 were executed before the trials ended.