A History of child laborIn the United States it took many years to outlaw child labor. By 1899, 28 states had passed laws regulating child labor. Many efforts were made to pass a national child labor law. The U.S. Congress passed two laws, in 1918 and 1922, but the Supreme Court declared both unconstitutional. In 1924, Congress proposed a constitutional amendment prohibiting child labor, but the states did not ratify it. Then, in 1938, Congress passed the Fair Labor Standards Act. It fixed minimum ages of 16 for work during school hours, 14 for certain jobs after school, and 18 for dangerous work. Today all the states and the U.S. government have laws regulating child labor. These laws have cured the worst evils of children working in factories.