The Treaty of Nanking (1842), which concluded the First Opium War, is considered a major turning point in Chinese history because it:
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A
Led to the immediate legalization of the opium trade.
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B
Marked the beginning of the erosion of China's sovereignty.
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C
Caused the Taiping Rebellion to break out.
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D
Established formal diplomatic relations between China and Britain on an equal footing.