Can you imagine having to carry different currency for every state in the USA?

Actually, we did have different currency for every state before the "American Rebellion" or whatever you guys call our war for independence. I'm not exactly sure at what point the state currencies dissolved in favor of national common currencies though. I know there were multiple kinds of currency in the US until the Civil War era (in the 1860s also called the "War of Southern Independence" or the "War of Northern Agression" in the South)

Then again...with a common language and government, I imagine it was quite a bit easier for us to switch to a common currency.