<span>Communism is the word your looking for.
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Communism is a economic and/or social system in which all (or nearly all) property and resources are collectively owned by a classless society and not by individual citizens.
North Korea is an example of communism.
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Different countries use different currencies.
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The right choice is:
Islamic armies conquered major cities to help spread Islam in three continents.
Explanation:
Following the death of the prophet Muhammad in the 7th century, a powerful wave of Arab, Muslim expansion swept across Asia, Europe and Africa. They established caliphates and empires that turned into major centers of learning and study in the next centuries.
The Industrial Revolution transformed economies that had been based on agriculture and handicrafts into economies based on large-scale industry, mechanized manufacturing, and the factory system. New machines, new power sources, and new ways of organizing work made existing industries more productive and efficient.