It's headquartered here, just an FYI.
You're right. It mergered with Wendy's in 1995. It stayed a separate entity though. The same year it entered the U.S. market; according to the site, I just found:
http://www.timhortons.com/en/about/history_1995.html
But, apparently it got its start in Hamilton, Ontario in 1964.
Interesting