Birdman, the constitution gives the federal government plenary control over monetary policy - new currencies that compete with federal tender in this area are unconstitutional because they are an attempt to exercise a power that is granted to the federal government, not to the states, in the constitution.
Designating new forms of legal tender, apart from the ones designated by the federal government, is an instance of this. The Feds have said their dollar is to be legal tender and it's to have nothing to do with gold in the USA (exercising an express power), and states are designating an alternative (frustrating the exercise of the power.)
I dug out a case from first year constitutional law that sums this up quite handily:
Online here:http://supreme.justia.com/cases/federal/us/75/533/case.html
Okay, now I'm getting really pissed.
1. You STILL haven't addressed my point of state currencies.
2. The case you cited does say what you say, HOWEVER, it was in relation to the federal govt taxing STATE bank notes. It was upheld, as to EFFECT the power to create a federal currency, congress had to make other currencies THAT WERE LEGAL less attractive.
The whole point of that case was the tax on state issued notes WAS constitutional. Therefore, the issuance of those notes (again, pre-FRA) was also constitutional.
Also, pre-national bank acts, there wasn't a tax, and state and private monies WERE issued.
You haven't addressed why those weren't constitutional, are STILL arguing around, rather than addressing my question, which was, AGAIN: (since you can't seem to read, but rather want to seem smart, ill even clarify)
If private issuance of money was unconstitutional pre-federal reserve act, WHY WERE LAWS NEEDED TO TAX IT AND/OR STOP IT!
Unconstitutional behavior, lets say, the only CRIME mentioned in the constitution (treason), doesn't need additional laws to make it illegal.
Your ORIGINAL point was private or state money issuance wss unconstitutional, yet if was done, until laws (not amendments) were created to tax or stop it, which means it WAS constitutional.
The TL:DR version: Go fu@k yourself you condescending fuc&wad and answer the goddamn question or shut the hell up.