Unilineal Evolution: Linear Progression

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Unilineal Evolution is the theory that societies evolve in a linear progression. At the beginning of the line of progression you have the least progressed societies or “savage” societies. At the mid-point of this line there are the “barbarian” societies and at the end of it is the “civilized” societies. There really are no strengths in Unilineal Evolution. All the information is based on the bias that undeveloped societies are less intelligent which is overall a racist
Diffusionism is the theory that societal change happens when societies borrow cultural traits. To explain why some societies lose some cultural traits, it is said these societies degenerate. So underdeveloped cultures forget what they learned that would push them into the civilized