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.
If you were talking about the cotton gin greatly increased the speed of removing cotton seeds from cotton, making production cheaper and encouraging mass production. However, it also caused the slave trade to sky rocket as well.
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Answer:
The housing and urban development act of 1965 and the fair housing act of 1968 were both aimed at improving housing and living conditions in cities.
