Because you would want to have a better understanding and from some one who witnessed or they were involved in. Secondary is when you read about something in a book or article,you werent there to see it happen or to actually witness it.
The Yuan dinasty (Mongol origins) ended in 1368 and was replaced by Ming dinasty, after Zhu Yuanzhang's Peking conquest.
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cucumbers, beans, cabbage, onions, and garlic. Figs, grapes, and apple
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The Commission's 1968 report, informally known as the Kerner Report, concluded that the nation was “moving toward two societies, one black, one white—separate and unequal.” Unless conditions were remedied, the Commission warned, the country faced a “system of 'apartheid'” in its major cities.
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