Answer:
The Origins of the Caste System
According to one long-held theory about the origins of South Asia's caste system, Aryans from central Asia invaded South Asia and introduced the caste system as a means of controlling the local populations. The Aryans defined key roles in society, then assigned groups of people to them.
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the abacus, the sundial, and the Kongming lantern
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“Old Ironsides” and “The Star-Spangled Banner”
It prompted competitive countries to send unmanned space probes to the Moon, Venus and Mars.
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It got raised because now that there was less tea, people knew people would pay whatever price for tea
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