The history continues with the many exciting and historically consequential events of the mid-19th century. In this Part 4 episode, the history of Guangzhou takes a dramatic turn as the Europeans start showing up in greater numbers clamoring for more trade and more access to the China market. The Qianlong Emperor calls for the Canton System which leads to a number of "stepping stones" that ultimately results in the Treaty of Nanjing. And now with four additional treaty ports opened to trade, Guangzhou's importance starts to wane. Learn more about your ad choices. Visit megaphone.fm/adchoices