In 1867 Canada looked like this:
The next use was quite awhile later in 1791 the province of Quebec was split into Upper and Lower Canada what makes this even more confusing is upper Canada is called Ontario in the 1867 picture. I could go into Upper and Lower Canada and why it happened but this post is going to be long enough. In 1840 Upper and Lower Canada were united into a single psedu-nation under British Rule this was mostly because Lower Canada because the French had a majority in Lower Canada and a minority in combined Canada to vastly oversimplify it.
The thing we are calling year 0
Manitoba, Act 1870
British Columbia terms of Union 1871
John A. Macdonald changed it to a railway. Again I could say a lot more but that is probably enough.
Prince Edward Island Terms of Union 1873
Saskatchewan Act and Alberta Act September 1st 1905
Newfoundland Act 1949
I could expand on any of these but there is a basic Run down of the Formation of the provinces of Canada. Happy Canada Day everyone.