The film captures the awesome scale of the migration and its cultural importance, as well as the social impact of China's urbanization. It's really devastating.
The governments are different though. And China's problem of keeping everyone employed and having bright enough futures that they won't revolt is far greater and more urgent than the US's, it doesn't mean the US doesn't have the problem. A lot of the reason for wage stagnation in the US is because profits were diverted and invested in China to help growth there. The profits from those ventures ended up staying in China where it fueled a boom, but even then it was only a fraction of what is needed to get everyone employed in jobs with future growth potential. If it slows enougb to start failing, it has the potential, with so many people, to be pretty nasty.
I think China is a pretty fascinating place, with definite problems, but still pretty fascinating.