The DOMINION chain of supermarkets originated in Toronto in 1919. In 1985, it was acquired by a Canadian division of the Great Atlantic & Pacific Tea Company (A & P). The Montreal-based Metro grocery chain bought the holdings of A & P Canada in August 2005 and rebranded all A & P and DOMINION operations during 2008. Stores currently operating in Newfoundland, under a Dominion banner, are actually owned by the Loblaws chain and are not affiliated with the former DOMINION company.

Graphic from the Argus Corporation

Brampton, Ontario's LOBLAWS also came into being in 1919. By the mid-20th century, there were stores across Canada and in New York State and Pennsylvania. In the present, LOBLAWS operates only in Canada and also under several regional banners. These include ATLANTIC CASH & CARRY, FRESHMART, PROVIGO ["Prah-vuh-go"], RED & WHITE FOOD STORES and ZEHRS. It is the largest supermarket conglomerate in the nation. 

Graphic from Loblaw Groceterias Company, Limited