Overtime, how did europeans use racism to support their prejudices and preferences?

Europeans highly used the influence and apparatus of science to support their racial preferences and prejudices by viewing the culture and achievements of Asian and African people through a new kind of racism, expressed in terms of modern science. Hierarchy of races with the whites this is the result because race determined in the view that human intelligence, moral development and destiny. . Although physical differences had often been a basis of fear or dislike, in the 19th century. 

The Europeans especially the British have been involved in getting to spread their rule in the world. Their thirst for power and their conquest of adding different countries to their colonies is recorded in history. To achieve their political goals these guys have been using different strategies. Amidst those strategies, using racism is one of the most widely used. They use racism in one of the most flattering way and manipulate this to gain anything possible in politics.

during the ming dynasty