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Imperialism is a policy of extending a country's power and influence through diplomacy or military force. Or in simpler terms, it can be defined as a rule by an emperor.
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Explanation:
composition of population means the distribution of the number of the population according to characteristics such as age,sex,marital status,socio-economic status. ... It helps to find out the structure of population. It helps to study on various demographic indicators
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A reference group is a group that people compare themselves to—it provides a standard of measurement. In U.S. society, peer groups are common reference groups
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