What were the four main causes of imperialism

Economic - motives included the desire to make money, to expand and control foreign trade, to create new markets for products, to acquire raw materials and cheap labor, to compete for investments and resources, and to export industrial technology and transportation methods. 2.) Political- motives were based on a nation's desire to gain power, to compete with other European countries, to expand territory, to exercise military force, to gain prestige by winning colonies, and to boost national pride and security. 3.) Religious- motives included the desire to spread Christianity, to protect European missionaries in other lands, to spread European values and moral beliefs, to educate peoples of other cultures, and to end slave trade in Africa. 4.) Exploratory- motives were based on the desire to explore "unknown" or uncharted territory, to conduct scientific research, to conduct medical searches for the causes and treatment of diseases, to go on an adventure, and to investigate "unknown" lands and cultures.

February 1848 is when it was added. if that's what you were asking