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In the United States, all powers not explicitly outlined in the Constitution are held by the constituent states; and are called not delegated powers.

Explanation:

As the States are preexisting to the Federal Government, they are who created the Nation and, therefore, are the reason for its existence.

When creating the Union, the states delegated certain powers to it, but retained others to exercise them directly, without the need for a higher central power. These powers are called "non-delegated powers," since they are the powers retained by the states at the time of the creation of the Federal Government.