Not to dissuade further discussion, but this is a frequently asked question.

The FAQ links this answer from /u/The_Western:

https://www.reddit.com/r/AskHistorians/comments/10ixf3/why_didnt_other_british_colonies_such_as_colonies/c6fgl78/

But there are other answers from /u/CosmoDanger:

https://www.reddit.com/r/AskHistorians/comments/4a3xbp/why_was_canada_not_involved_in_the_american/d0x6utq/

and /u/Irishfafnir:

https://www.reddit.com/r/AskHistorians/comments/ucymy/why_didnt_the_canadian_colonies_join_the_rest_of/c4ubgma/

and a few more here:

https://www.reddit.com/r/AskHistorians/comments/2uu99i/why_didnt_canada_join_the_american_revolutionary/