It is a federation of 50 states, a federal capital district (Washington, D.C.), and 326 Indian reservations. ... Outside the union of states, it asserts ...

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Today, the United States is one of the world's most ethnically mixed and multicultural nations. It is the product of large-scale immigration from many countries ...

In the United States, a state is a constituent political entity, of which there are 50. Bound together in a political union, each state holds governmental ...