Sure, I can help you with that. Child labor in America started around the mid-18th century and gradually intensified during the Industrial Revolution in the late 19th century. It reached its peak in the early 20th century. The exact year when child labor started and ended is not specific, as it varied from industry to industry and also by state legislation. However, in general, we can say that child labor in the United States began in the late 1700s or early 1800s and started declining significantly after the passage of federal child labor laws in the early 20th century. So we can round it up to "the late 1800s to early 1900s" as the period when child labor began and ended in America.