How sure you are that USA controls bitcoin? I dont think that bitcoin can be manipulated or being controlled by anyone. I guess all of us are the one who affects bitcoin price since all of us are bitcoin holders especially to those bigtime amount holders of bitcoin. It cant be manipulated by anyone and thats the nature of bitcoin.
Really, I think bitcoin is crytocurency free in other words nothing is set. But some people who have substantial funds could play a bitcoin prices that often we know by the nickname "whale". But I'm not too concerned about it. And I think also of China has nothing to do with bitcoin, the same as other countries china only bitcoin users. hehe