NY makes more money (and collects more taxes) than e.g. Alabama. So NY finances Alabama. In the EU, Germany implements capital controls in Greece. That's the d

NY makes more money (and collects more taxes) than e.g. Alabama. So NY finances Alabama. In the EU, Germany implements capital controls in Greece. That's the difference. US is a monetary and fiscal union that has free movement of labor and capital. The EU cannot only be the latter.