This document provides a summary of the history and development of workplace safety in the United States. It describes how common law in the 1800s placed the burden of proof on injured workers. Early safety laws in the late 1800s focused on guarding machinery and mine safety. The first workers' compensation laws began in the early 1900s. Major events like the Triangle Shirtwaist Fire in 1911 and Cherry Coal Mine disaster in 1909 increased calls for safety reforms. The Occupational Safety and Health Act of 1970 established OSHA to enforce safety standards and protect workers' rights. Over time OSHA has developed additional regulations and standards on hazards like silica, asbestos, lockout/tagout and more.