The Currency Act of 1764 was the primary cause of the American Revolution. Before King George and the British Parlimaent passed the Currency Act the colonies were prospering, but when they were forced to pay for all goods imported from England with gold and silver they were forced to borrow from the London bankers in order to pay for the everything they imported from England.
The reason that during the Revolutionary War the Colonial currency became worthless was because so much counterfeit currency printed by the London Bankers the currency became virtually worthless.
The Constitution granted to Congress the authority to issue our money and the responsibility to regulate its value. In order to prevent inflation it is necessary to issue an amount of money equal to the Gross National Product. Printing too much money creates inflation and devalues the dollars in circulation..
The punishnment for counterfeiting and/or debasing the currency was the death penalty.