The correct answer to this open question is the following.
The effect of the Age of Imperialism from 1750-1914 on various regions of the world was that the Catholic Church and the Christian Church assumed that as part of the imperialistic efforts to conquer new lands to exploit raw materials and natural resources, European nations also had the obligation to evangelize and convert the native Indians into the Catholic or Christian religion.
So European conquerors made everything they could to force Native Indians to abandon their history, traditions, culture, religion, and belief systems, in order to evangelize them. European people considered native people in the Americas or in Africa as primitive people that needed to be educated.
This happened in North America with the colonization of white British people. Something similar happened in Mesoamerica with the arrival of the Spanish conquerors, similarly to what happened during the Scramble for Africa, after the Berlin Conference of 1845.
So we could say that Europeans thought they had the moral obligation to bring Christianity and civilization to the uncivilized is known as the colonization of Indians or the Evangelization of Indians.