The goals of 19th and 20th century Imperialism were very often related to the European belief that Europeans were both racially and morally superior to others, particularly Africans. Europeans invaded Africa with the purpose of instilling Christianity into natives as well as introducing western ideas in education, medicine, hygiene, and monogamous marriage. The colonization of Africa was also of commercial interest (which was greatly expanded due to the Industrial Revolution during this time period). Africa provided European manufacturers with cheap labor, raw materials, and a ready market to purchase their products.
There was no reason. The demons probably took over the leaders and made the evil move at the time.
