Welcome to the United State Goverment people! Who else would have the power to manipulate the price like this, and the motive to do so?? All those tax free transactions are eating at then, and they can't take it anymore!!
Or not. Anyone with $10M can easily manipulate the Bitcoin market. That won't change until the markets are much deeper and much bigger. It hardly takes the resources of a nation state and certainly not the United States. Somolia central bank would have the resources to push the Bitcoin market around.