Answer:
act or practice of segregating; a setting apart or separation of people or things from others or from the main body or group: gender segregation in some fundamentalist religions. the institutional separation of an ethnic, racial, religious, or other minority group from the dominant majority.
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Question : How many years ago was vietnam war
Answer : It ended in 1975, and it is 2016, so around 41 years ago.
Machines were being used on farms around this time, so less people on farms were needed. So these people moved to cities for work.
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Scarcity is the condition of not having enough goods and services to satisfy everyone's needs. This is an economic concept whereby certain conditions in a society such as war, drought, or political instability have led to scarcity of certain goods and services that are preventing the needs of the society's people from being met.