The background was the rapid development of world capitalism at that time, and the Qing Dynasty closed its doors to the outside world.
China's foreign trade is unbalanced, so the powers should reverse the trade deficit and start smuggling opium.
1June 840, the Opium War broke out.
Dinghai is the place occupied by the British for the longest time.
1842 In August, the British army cut off the main grain transportation route of the Qing government, and the Qing government was forced to negotiate peace.
China was defeated,
Treaty of nanking, the first unequal treaty in China's history, was signed.
The direct fuse was the destruction of opium in Lin Zexu and Humen.