If being on a common monetary policy is a big problem for different European economies, why isn't it also a big problem for the economies of different US states? I have read a lot of opinions lately that say that the fact that very different European economies with different specializations and needs are on the same currency and under the same monetary regime is a fundamental flaw in the Euro project. However, it seems like the same thing is basically true in the United States, so I wonder why we don't see the same kind of crises and divergences there that we are seeing between the "core" and "periphery" in Europe?

Is it really true that, say, New York and Mississippi have basically the same needs in terms of monetary policy? If so, why are these more convergent than the needs of European countries?