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Opium War
The British sold opium to the Chinese who became addicted. To pay for the opium, the Chinese depleted most of their silver supply, greatly weakening the Chinese economy. The treaty of Nanjing ended the war, and opened up trade in China. William McKinley pushed for the open door policy, which would allow all countries to have equal access to Chinese trade. What originally weakened China's economy, helps it greatly today.
