In 1839, The First opium trade war was fought between Britishers and China over trading rights, open trade, and especially diplomatic status.
In 1842, the war was concluded with the treaty of Nanking between China and Western power according to this treaty china ceded the Hong kong island and smaller islands which are surrounded by the United Kingdom which establish 5 treaty ports in Shanghai.
Thus, In the first opium trade war, the Britishers were struggling against china over trading rights and open trade for opium.
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