could be wrong but i believe the answer is the theories of Social Darwinism were often used to justify the efforts of certain political, social, or economic views.
Before the arrival of Europeans, many North American populations used their environments as a means to survive. For example, many indigenous populations hunted animals, grew crops (like corn), and moved constantly in order to follow big game (such as buffalo). Regardless, many populations did not view land as something that can be possessed by one individual or group. Rather, they saw land as something that all members of the community could use.
This drastically changed with the arrival of Europeans. During this time, Europeans viewed land as something that individuals controlled. Along with this, land was viewed as extremely valuable due to the resources it could provide. These differing views of land caused significant problems between Europeans and indigenous people.
King Ezana also converted to Christianity. He was a devout Christian and Christianity became the major religion of the kingdom. Aksum was perfectly located to become a major center of trade. Merchants would travel from central Africa, Persia, India, and Egypt bringing their goods to Aksum to trade.