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As of 2020, the majority of people belong to sedentary cultures. In evolutionary anthropology and archaeology, sedentism takes on a slightly different sub-meaning, often applying to the transition from nomadic society to a lifestyle that involves remaining in one place permanently.
Civil War killed off slavery and declined the southern economy it also acted as a catalyst to make America into a complex industrial society of capital, technology, national organizations, and large corporations.
If this is about Vietnam then the answer is C