This is Sadie Pfeifer, a 9-year-old Cotton Mill Spinner from South Carolina. She was one of tens of thousands working in factories, fields, and mines across the world during the late 1800s early 1900s. There was a serious child labour problem in America and across the globe during this time. The 1900 federal census revealed that 1.75 million children (1/5th of children) <16 years old were working. Why? The industrial revolution…