To cut ties with the Native American culture and adapt to the American culture.
Religion permeated every aspect of Aztec life, no matter what one's station, from the highest-born emperor to the lowliest slave. The Aztecs worshipped hundreds of deities and honored them all in a variety of rituals and ceremonies, some featuring human sacrifice.
In the 15th century, Europe sought to expand trade routes to find new sources of wealth and bring Christianity to the East and any newly found lands. This European Age of Discovery saw the rise of colonial empires on a global scale, building a commercial network that connected Europe, Asia, Africa, and the New World.
Ethiopia was the only African nation that was not colonized, the Ethiopian forces successfully defeated the Italians during the battle of Adowa which was led by Menelik the second. This helped the nation kept their independent.Unlike other African nation Ethiopia had strong military force and huge sense of nationalism which made their resistance successful.