You might interested in these questions from the FAQ section on why Canada did not join the USA in the aftermath of the American Revolution:

• Why didn't Quebec join the 13 Colonies' revolution against England? - 94 comments, over 2 years old.
• The comments go into the friction between the largely Catholic Quebecois and the largely Protestant Thirteen Colonies.
• Why didn't other British colonies such as colonies in the Caribbean and Canada fight for independence with the American colonies? - 11 comments, over 2 years old.
• In this thread, changes in British policy as well as the vastly different colonial situation are highlighted explained in relation to independence movements.
• Why didn't the Canadian colonies join the rest of the American colonies in the American revolution? - 24 comments, over 2 years old.
• The flaired commenters in this thread discuss the anti-Catholic actions of certain groups within the Thirteen Colonies in context with what was a mostly French catholic Canada.
• Why did the Canadian Colonies NOT join the war for independence along side American Colonies? - 40 comments, over 2 years old.
• Besides linking to previous threads, some top level comments further down discuss the influx of loyal Scottish immigrants to Canada as a major cause for its continued loyalty to Britain.
• Why did the areas that are now Ontario, New Brunswick, PEI, etc. not participate in the American Revolution? - 8 comments, over 3 years old.
• The topmost top level comment goes deeper into the smaller scale politics and happenings inside Canada that were contemporaneous with the American Revolution.
• why wasn't Canada the 14th colony? - 5 comments, over 3 years old.
• One of the flaired commenters describes in this thread the "fiscal-military" state of Britain in relation to why the British Isles accepted a high level of taxation and why the Thirteen Colonies chafed under a much lower level of taxation.