When sound arrived in Hollywood in the late 1920s, Canadians were already holding some of the most important roles in the motion picture industry. Louis B. Mayer, from New Brunswick, was boss at MGM; Jack Warner, from Ontario, was head of Warner Bros. Studio; and Mack Sennett, from Quebec, was still King of Comedy. Canadians like Mary Pickford, Marie Dressler, and Norma Shearer moved easily from silents to talkies - this illustrious trio won the first...