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Why can't a US state default, but a EU state can?
But do you know about a US state risking to go default now or in the past?  In 1847 four states - Mississippi, Arkansas, Michigan, and Florida - failed to pay all or some of their debts.  All of these states had issued debt to invest in banks.  From the detailed source listed below: "...it should be remembered that all cases of state debt  repudiation, as contrasted with mere default, involved banks."  Jackson had killed the federal central bank 10 years earlier and the states were trying to create their own inflationary central banks.  Six other states delayed debt payments from three to six years (source, page 103, this source has more details).  This is the only case I know of where US states defaulted.  US cities default more frequently. I'm very confused do US single states like IOWA have debt and emits obligations on their own like Italy does in EU? Yes.  Individual states can issue their own bonds. Oh, and just another little thing I would like to know, is Dollar a fiat currency too like the Euro? Yes, the US dollar is a fiat currency.  I think the better question is: "Is there any currency that is not a fiat currency?"