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Jessie Esser
Societies that evolve in response to changes that happen in their natural and social environments.
http://education-portal.com/academy/lesson/gerhard-lenskis-theories-of-sociocultural-evolution-social-stratification-technology.html#lesson
http://www.faculty.rsu.edu/users/f/felwell/www/Theorists/Essays/Lenski2.htm
We will continue to grow as a society but we will never be able to go back to older societies