Why were the "Five Civilized Tribes" considered to be civilized?

The word civilized was applied to the five tribes because, broadly speaking, they had developed extensive economic ties with whites or had assimilated into American settler culture. Some members of these southeastern tribes had adopted European clothing, spoke English, practiced Christianity, and even owned slaves.

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the fact that could also be added to column b is that during world war ii, specifically between the years 1941 and 1945, japan expanded its territory towards the indonesian territory in what was known later as part of the "pacific war". in that time, japan could conquer the philipines, singapore,   borneo, central java, malang, cebu, sumatra and various other islands of the area, therefore expanding its territory for a brief period of time.