The modern biological definition of race developed in the 19th century with scientific racist theories. The term "scientific racism" refers to the use of science to justify and support racist beliefs, which goes back to the early 18th century, though it gained most of its influence in the mid-19th century, during the New Imperialism period. Also known as academic racism, such theories first needed to overcome the Church's resistance to positivist accounts of history and its support of monogenism, the concept that all human beings were originated from the same ancestors, in accordance with creationist accounts of history.