What form of government in the United States of America? What evidence is there for your choice?

The US is a federal government.

Explanation:

The federal system divides the government to the federal governments and smaller governments (the state & local governments for the United States). It is also a indirect democracy in how it goes about passing laws, electing officials to do the bidding of the people.

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to provide for the common defense to form a more perfect union to promote the general welfare

the answer is expolration. hope this !