Final answer:
The United Province of Canada consisted of Ontario and Quebec before they joined the Dominion of Canada in 1867.
Step-by-step explanation:
The two areas that were known as the United Province of Canada before they became part of the Dominion of Canada in 1867 are Ontario and Quebec. The British North American Act passed by the British Parliament led to the joining of Nova Scotia, New Brunswick, and the Province of Canada, which included Ontario and Quebec, into the Dominion of Canada. The Dominion was self-governing, though it remained within the British Empire with Queen Victoria as the head of state.