Look at why Europe is so messed up right now - they adopted a single currency without a real government to match. Much as I might not like her, Margaret Thatcher was right when she said that "single currency is a federal Europe through the back door". It's either that or big trouble down the line.
We adopted a single currency, which is the new government-enforced legal tender. You're right that it caused plenty of problems, but it's hardly relevant as an example of destabilization caused by many currencies.
We adopted a single currency, which is the new government-enforced legal tender. You're right that it caused plenty of problems, but it's hardly relevant as an example of destabilization caused by many currencies.