Trivial Tuesday

OK, so it seems I like this break in protocol by Babybull.  She not only came up with the category for this week's question, she came up with the question.  I will be answering it since she did not let me in on the little fact, so without further ado, here's what was deleted from last week's post:
I have a question for Trivial Tuesday. A Canadian twist for all.Which were the first four provinces named as Dominion Of Canada on what date? Thanks for playing..
I will make my guess after everybody else.  Babybull, do not reveal the answer until Thursday.  If this works out, I may allow all of you the option.