China and Britain fought in a war and it wasn't just any war, it was the opium and they actually fought twice in the opium war but China had lost.
If your wondering why, come with me i can tell you all about it, once we get inside it's cold.
Imperialism In China
Technically the war's settlement forced Chinese ports open and gave Hong Kong to Britain. It began what China calls the Century of humiliation,when foreign powers forced weak Chinese governments to cede territory and sign unequal treaties. Britain and France waged a second Opium War against China from 1856 to 1860.