How did the Supreme Court decision to throw out laws about children at work helping big businesses, which grew under another Supreme Court decisions?

Although the Keating-Owen Act was passed by Congress and signed into law by President Woodrow Wilson, the Supreme Court ruled that it was unconstitutional in Hammer v. Dagenhart 247 U.S. 251 (1918) because it overstepped the purpose of the government's powers to regulate interstate commerce.

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yellow fever and other tropical diseases