The earliest recorded strike by Chinese immigrants to the U.S. occurred when stonemasons brought to San Francisco to build the three-story Parrott granite building - made from Chinese prefabricated blocks - struck for higher pay - 1852

National Typographical Union founded, Cincinnati, Ohio. It was renamed the International Typographical Union in 1869, in acknowledgment of Canadian members. When the ITU merged into CWA in 1986 it was the oldest existing union in the U.S. - 1852

Ohio makes it illegal for children under 18 and women to work more than 10 hours a day - 1852