Final answer:
Lewis Hine's photographs were instrumental in changing labor laws in the US by bringing attention to the need for labor reforms and generating public support for legislation.
Step-by-step explanation:
Lewis Hine's photographs were instrumental in changing labor laws in the US. Hine documented the harsh working conditions of child laborers and other workers in the early 20th century, which brought attention to the need for labor reforms. His powerful photographs helped to generate public support for legislation that improved working conditions and protected workers' rights.