Yes, China generally hasn't been expansionist. They have taken countries close to their borders (Mongolia and Tibet) and there is historical animosity with Taiwan and with Japan over the Spratley Islands but other than that, I can't see them becoming aggressive to their neighbours in the region. They will just grow more and more economically powerful if the aging population time bomb doesn't harm them too much.
As for the US government, in the wake of the drones, extra-judicial killings and PRISM scandal, I think more and more of us are really waking up to the fact that the Republicans and Democrats are just two sides of the same coin. Obama is extending W.'s policies, not curtailing them.