It is truly a union of united States and not a confederacy to be dissolved at the whim or petulance of any one of the 48 States. Court decision has evolved several rules of interpretation. Federal legislation has necessarily been held to be supreme in fields involving exclusive Federal power. such as in fields of foreign relations. war. immigration. and coinage. If this were not so. these United States would be like Europe with its barriers between countries. its intrigues. its various monetary systems with cumbersome exchanges. A Federal act is also supreme where it expressly supersedes a State statute or declares a field subject to exclusive Federal jurisdiction.
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immigration