I've noticed that quite of few non-Canadians read this blog. I suspect my foreign readers, unless they are from a Commonwealth country, don't quite understand how Canada can be an independent nation and yet share a monarch with 15 countries (including the United Kingdom, Australia, New Zealand, Bahamas, Jamaica and several other Caribbean countries, and even tiny Tuvalu). Here's the full list of countries Canada shares a Head of State with: The Commowealth Realms.
The various incarnations of the British (English/Scottish) Crowns have always included more than one kingdom: France, Ireland, Scotland, England, Germany, and Norway all have histories of sharing what was later called the British Monarch.
The term British itself is an admission that the Queen rules multiple kingdoms and has several parliaments.
Bet you didn't realize that Scottish Kings once considered Norway one of their kingdoms. Henry VIII of England, considered himself to be King of France, too. And many French Kings considered England part of their territory. Several 19th Century British Monarchs were also Electors of Hanover, in what is now Germany, and many of the King`s German subjects were counted among the loyalists who fled the American Revolution to British North America. (Canada)
This illustrates another important point: Citizenship in a Commonwealth country is not based on ethnicity. It`s based on adherence to parliamentary democracy and loyality to the Crown, including Parliament. (If only we could remember that!)
For a more modern understanding of Canada's constitutional monarchy, read, The Crown of Maples published by the Government of Canada. Just click on the headings and the text will appear.