http://chnm.gmu.edu/wwh/modules/lesson8/lesson8.php?s=0Women in the British Empire
While British women in the empire were always outnumbered by British men, from the beginning of empire women traveled to many sites of empire, where they established homes and found opportunities and a way of life not available to them in Britain. Beginning around 1850, the numbers of white women living in the empire increased, partly because the empire grew considerably in the later 19th century—the period historians call the Age of New Imperialism—and partly because of the rising concern in Britain over the relationships between British men and indigenous women. Encouraging white British women to travel to the colonies was seen by the British as a way to protect and maintain the social hierarchy of the colonial world, while preserving British racial purity.