RTHK, the Hong Kong television network, produced an excellent documentary on Overseas Chinese in North America consisting of 5 hour long episodes aired over the late summer of 2012.
This ambitious project, although it could only scratch the surface of the history of Chinese in North America, nonetheless was a significant contribution by providing audiences in Hong Kong with an overview of the many difficulties that Chinese who left for Gold Mountain had to suffer, but were able to eventually overcome. This documentary serves as an invaluable historical resource for Hong Kong Chinese.
Below are links to the 5 programs on YouTube. Some of the commentary is in Chinese, and the subtitles are also in Chinese, but many of the interviews are conducted in English. I was a consultant and interviewee in the fourth episode which focused on Chinese laundries and restaurants.