In the mid- to late 1800s, Hamilton became an industrial city with lots of factories . It was close to limestone from the Niagara Escarpment, coal from the United States, iron ore mined from northern Ontario. But factories demanded that people work hard jobs for long hours. In 1872, Hamilton workers marched for a work day of no more than nine hours! The two large steel factories were Stelco (the Steel Company of Canada), created in 1910 and the Dofasco (Dominion Steel Casting Company) in 1912. Dominion is an old word often heard to describe Canada when it was part of the British Empire.