How old do you have to be inorder to work in the United States, and what year was that law passed

How old do you have to be inorder to work in the United States, and what year was that law passed?
i need to know as much about the rights of passage of a teen in America, as possible?
Law & Ethics - 1 Answers
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Actually it varies from state to state. They all have different laws of how old you must be and how many hours a week you are allowed to work.