The Opium wars happened when China did not want Britain trading opium with their people anymore. This trade was causing people to become addicted and also it was sucking a lot of money out of the country and into Europe. However, when they asked Britain to stop and insulted them in doing so, it resulted in a very easy win for Britain. After that, the British sucked even more money out of China to repair the economic and physical damages the war had caused. Also, they took over most of Chinas Economy. This relates to key concept 5.2.