Edit: After reading responses, I realize that there is a better question to ask: What people in the US in general do to help (vote a certain way, write to certain politicians, change purchasing habits), and how can I specifically participate in that?
One idea would be to run workshops for children/or families teaching them how to repair their devices, and which devices to get if they want them to last (think upgradability, battery-replacement, similar). If we're wanting to lessen China's power over the working class, making people capable of maintaining electronics in the same way they can maintain cars will go a long way. Bonus points if you teach them how to reinstall operating systems without bricking their systems.
Another idea would be to use your programming ability to create software to help people: think getting past censorship, keeping communications secure, similar. China and Hong Kong both are more or less tech wonderlands, solving the UX issues that stop anyone from throwing a single-board computer (think Orange/Raspberry Pi) online and using it to communicate over the open web and store data without fear of it being compromised in some way by doing nothing more than flashing an OS image and booting would mean that almost everyone would gain, but especially people in those countries.