also: あへんせんそう
noun
Opium War (1840-42)
Historical term referring to the conflict between Britain and Qing China over trade, particularly opium.
アヘン戦争は1840年に始まった。
The Opium War began in 1840.
アヘン戦争の結果、香港が
As a result of the Opium War, Hong Kong was ceded to Britain.