Why should the state control money? It’s a license to steal, and states invariably exercise it. From Jacob G. Hornberger at fff.org:
The United States once had the finest monetary system in history. It was a system that the U.S. Constitution established. It was a system in which the official money of the United States consisted of gold coins and silver coins.
We often hear that the “gold standard” was a system in which paper money was “backed by gold.” Nothing could be further from the truth. There was no paper money in the United States. That’s because the Constitution did not empower the federal government to issue paper money. It also expressly prohibited the states from issuing paper money.
The Constitution used the term “bills of credit.” That was the term people at that time used for paper money. The Constitution expressly forbade the states from issuing “bills of credit” or paper money. It also did not delegate the power to issue “bills of credit” or paper money to the federal government.
Instead, the Constitution empowered the federal government to “coin” money. At the risk of belaboring the obvious, one does not “coin” money out of paper. One “coins” money out of such metallic commodities as gold and silver.
The Constitution also expressly forbade the states from making anything but gold and silver coins “legal tender,” or official money, which further established the intent of the Framers.