The Imperialism that helped force the importation of opium to China by the British empire resulted in nothing "good". The Chinese were exploited, and this only helped to increase imperialism. Never a good thing.
they got it from India then manufactured the opium
There were a number of Wars during the reign of Queen Victoria. The related link below will inform you about them.
The tea and Opium trade
There were 2 Opium Wars, the First Opium War was from 1839-1842 the Second Opium War was from 1856-1860
china was forced to legalize the importation of opium.
Britain and China
Britain
China.
The tea and Opium trade
Two.
The opium wars were never signed. Wars are declared or undeclared, not signed.
The Opium wars ruined the Chinese functioning society