One of the big foreign policy challenges facing the next US president is how to handle China.
Trade has grown exponentially between the two nations but bilateral ties remain strained.
The US accuses Beijing of locking up political dissidents and brutally suppressing a separatist movement by Uighur Muslims.
But China has published its own reports on human rights abuses in the US, saying Washington has been incapable of lifting many African-Americans out of poverty.
In our second of a series of reports examing this fractious relationship, Al Jazeera's Tony Cheng has more.