Why were attempts by congress to regulate child labor and factory conditions in local workplaces struck down by the supreme court as unconstitutional in the late nineteenth century? regulating local workplaces was perceived to be inconsistent with the full faith and privileges clause of the constitution. regulating local workplaces was perceived to violate the twenty-first amendment to the constitution. regulating local workplaces was perceived to violate the comity clause of the constitution. regulating local workplaces was beyond the scope of understanding of interstate commerce at the time and was, therefore, perceived to be an unconstitutional exercise of power by the federal government. regulating local workplaces was perceived to violate the strongly held value of regulated federalism?