Opium Wars- Imperialism in China

What happened during The Opium Wars?
The Opium war 1839-1842, Known as the most humiliating defeat in China. But what had happened during this time was china had signed a treaty with Great Britain. the treaty was a one sided treaty. The Chinese had to give up Hong-Kong to the British, they had to agree to extraterritorial rights (anyone from Britain or the USA who commit ed a crime in china could not be in trouble or charged in Chinese court). Now the British and other could use 4 other ports instead of the one Guangzhou. The war began because the wanted to force china to import Opium from British merchants. But the Chinese refused. and for 2 reasons, 1 they didn't want a Chinese addicts, and 2 they knew that England had baned Opium from coming into Britain.
they lost because British had better weapons. this was the Opium war.