One major reason why children were being used less in factories during the early 1920s was the passage of child labor laws. In the United States, the passage of the Fair Labor Standards Act of 1938 (FLSA) prohibited the employment of children under the age of 16 in most industries. Prior to this, child labor was a common practice in many industries, including manufacturing and factories. However, in the early 1920s, several states had already passed laws restricting or prohibiting child labor, which may have contributed to a decrease in the use of children in factories. Other factors that may have contributed to the decrease in child labor during this time period include the increasing availability of public education, changing social attitudes towards child labor, and economic factors such as the availability of adult labor.