Final answer:
Ontario, Quebec, Nova Scotia, and New Brunswick were the four original provinces that joined to create Canada.
Step-by-step explanation:
The four original provinces that joined to create Canada were Ontario, Quebec, Nova Scotia, and New Brunswick. In 1867, the British North American Act was passed, which joined these four provinces in the Dominion of Canada. This act gave the Dominion the right to govern itself while remaining within the British Empire.