Why did the Supreme Court rule the keating-Owen child labor act unconstitutional?

The Supreme Court ruled the Keating-Owen Child Labor Act unconstitutional in 1918 primarily because it overstepped the bounds of Congress's authority under the Commerce Clause. The Court held that the act improperly regulated local labor conditions rather than interstate commerce, viewing child labor as a state issue rather than a federal one. This decision reflected the Court's broader reluctance to allow federal intervention in economic matters at the time.