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The Treasury and US Mints.
Article I Section 8 of the United Constitution grants power to Congress to "coin money" and "regulate its value." In effect, The Department of the Treasury prints money under the authority of Congress.
Coin's are produced and made at the United States Mint.And our Paper money is printed by the Bureau Of Engraving and printing. So Both of these parties are able to make the money coin's or bill's.
The legal power to print money is called "monetary authority" or "currency issuance authority." In the United States, this power is held by the Federal Reserve.
Article I, Section 8 of the Constitution says that "The Congress shall have Power...To coin Money, regulate the Value thereof, and of foreign Coin," and Section 10 says that "No State shall...coin Money". It is illegal for private citizens to coin money.The Supreme Court has ruled that Congress's power to coin money includes the power to print paper money and make it legal tender.The Federal Reserve decides how much money will be produced. Paper money is printed by the Bureau of Engraving and Printing, and coins are produced by the United States Mint.( this is a wiki answers in the history category reproduced here. First answer by User:JohnBoyW. )Who_may_coin_and_print_money
Congress has the power to coin money.
Article I, Section 8 of the Constitution says that "The Congress shall have Power...To coin Money, regulate the Value thereof, and of foreign Coin," and Section 10 says that "No State shall...coin Money". It is illegal for private citizens to coin money. The Supreme Court has ruled that Congress's power to coin money includes the power to print paper money and make it legal tender. The Federal Reserve decides how much money will be produced. Paper money is printed by the Bureau of Engraving and Printing, and coins are produced by the United States Mint.
The Department of the Treasury
At the time the constitution was drafted and put in place only coin money was mentioned and acceptable. The power to "coin money" has obviously not been tested in courts. If it was that easy, then people would have brought suit and won this in the courts years ago. We obviously print money now. If this is unconstitutional, then we need to sue to bring the US in line with the Constitution. Good luck.
The power to coin money is an expressed power. This is a power that is provided to Congress in Article 1, Section 8 of the US Constitution.
BORROW MONEY
In the UK, mainly the Bank of England in conjunction with the Royal Mint - though subject to the influence of the Government and the Chancellor of the Exchequer.