the USD is very much subject to social media and traditional news manipulation. When the US decides it wants a stimulus package or other types of debt, it drives down the dollar's value. Granted the US is good about making payments to creditors, i.e bonds, it is not immune to fluctuation.
It is sad but the way of the dollar is slipping and the global demand currency. It is slowly being replaced by the CNY and other market demands.
Lastly, the Treasury does not control the dollar. It the Foreign exchange markets. (https://www.fool.com/knowledge-center/who-determines-the-val...)